Malicious PDF — malware analysis report

Static analysis result for SHA-256 373477f0a9b49ca6…

MALICIOUS

PDF

92.3 KB Created: 2021-03-18 22:06:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7cd70f972018bef63260224fc385f0b6 SHA-1: c8c7cc0a476ce7a2e23c489cdda6d5fcc8291410 SHA-256: 373477f0a9b49ca6d7ba025df2f7079b6475a6d568e396ab9c0cc3536865967f
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a malformed exploit stream and a high number of external links, many pointing to disposable hosting, indicating a link farm designed to redirect users. The primary malicious URL identified is 'https://dugedepap.ru/strik?utm_term=anthony+santos+popurri+2013+descargar', which is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dugedepap.ru/strik?utm_term=anthony+santos+popurri+2013+descargar PDF link annotation
    • https://cdn.sqhk.co/guvawatuzax/fW89Gif/asma_bronquial_gina_2016.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382420/normal_5fec9258bf67f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464700/normal_5fde41ed90a39.pdfIn PDF document text
    • https://cdn.sqhk.co/zorezibeb/jeDmhjO/29810824699.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/18b846ea-fd15-492e-98ed-6a9a84db1cf6/2770996041.pdfIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_564a68d7f0b7443ebb27862ebd7ada1c.pdf?index=trueIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_f2839aab28c0453083f7bac51035305a.pdf?index=trueIn PDF document text
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_f3abf11254fb4b0bb033faa1c583d2ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c45f2f6c-7113-4488-9715-372261c0be9a/verizon_router_g3100_wps_button.pdfIn PDF document text
    • https://a181bb3e-7445-4f1f-a1cf-b2fe66c13e92.filesusr.com/ugd/91ce54_5f2a70206bcc4384b7611af66530b2a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/retisovojor/merger_and_acquisition_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67c5fb07-4da9-4cc0-9622-1fb98a1e320b/rosafo.pdfIn PDF document text
    • https://d6ac5066-27fc-4e71-a07d-b30af50dfe8b.filesusr.com/ugd/934fc3_2172ba670a6c4ee58e5d3890fca95e2e.pdf?index=trueIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_f7275fa305e14c09a6dba40a0630f535.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/382da582-dab8-496b-9512-478b45433ceb/8273965731.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/xafurimu.pdfIn PDF document text
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_d5d06a7302b544a390d4ef7b4c82c9cf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lebaxa/mejezozoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54454d95-4326-476f-bce3-a59123253073/13408925778.pdfIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_ce77cd65042942dd86db7bcfb213ae77.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBA 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off0000fbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAE 5884 bytes
SHA-256: 6887b03f8ae756f809348ae6c87db9d5bdd4584c5f6ee12e9e54845f597dfff3
font_02_sfnt_off00010fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB3 4728 bytes
SHA-256: b044a2ee2ccae886500ae9cc25c187f74885c118186b63d2d89737bbef8b035d
font_03_sfnt_off000120e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E7 12348 bytes
SHA-256: 396ffab8d0676ae431b6fe9e5c21508c3696936cdb25d7c0230c086e95c51533
font_04_sfnt_off00014912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14912 17180 bytes
SHA-256: 07cb34b00b7d8cc8640cf9cd2e16338b0aefed2e4d1928b1e3c34ef080187915

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