Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1605c7a0fba6d57…

MALICIOUS

PDF

79.0 KB Created: 2021-03-18 02:42:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a80b9f4efa12e591d04e899294824782 SHA-1: 553b5f0a33b662752ebce83747d3c6a3697615a2 SHA-256: f1605c7a0fba6d5701daf0d86ce83d1eb058106d2a63fe7a584370f08d0714a8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://pelibifir.ru/award?keyword=full+oxford+dictionary+download+pdf PDF link annotation
    • https://siganagimub.weebly.com/uploads/1/3/2/6/132683357/wefowiribug_bomelopefuw_xigolares.pdfIn PDF document text
    • http://lerinumemikiw.22web.org/payback_2_apk_data.pdfIn PDF document text
    • http://molotkov.site/when_was_my_browning_a5_madevkbnd.pdfIn PDF document text
    • http://melakodesalef.22web.org/dictionary_english_to_gujarati_free_download.pdfIn PDF document text
    • http://koprovk.xyz/7050522270385zt0.pdfIn PDF document text
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/rekewux.pdfIn PDF document text
    • http://helpforteam.com/fuxezukotogowavazikq5ml.pdfIn PDF document text
    • http://photoforce.ru/tavanizekebobokikalucgno1.pdfIn PDF document text
    • http://islta.fun/twitch_banner_template_photoshop64q1s.pdfIn PDF document text
    • http://hookup153.online/33325614649ady57.pdfIn PDF document text
    • https://nobarolibefo.weebly.com/uploads/1/3/1/4/131407117/jojudogek_ratuxonuwijen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_2b712ae7d0c847ba9e9cb79ae1392d02.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xujitezu/98676845943.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/nespresso_vertuo_pods_guide.pdfIn PDF document text
    • http://gafiruxosu.rf.gd/xagapapotunoditipu.pdfIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_8b00457dd7a44c41a37b24ef223abca3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisiku/macbook_buying_guide_reddit.pdfIn PDF document text
    • https://cfecb619-c0f5-418d-ae9d-b1147643389f.filesusr.com/ugd/4cd51e_715a8c24e9804fe69534405c2c781158.pdf?index=trueIn PDF document text
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_b3897760fcd5422f81cd7256d672773c.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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E7 5188 bytes
SHA-256: c1a642ba67594ace8e2d8b24fcc17a5db63e36c90e57f674e748007026e005e2
font_01_sfnt_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 10656 bytes
SHA-256: dd3f3897fd5441a769c269cb1d97bac80b27cb3f3f49a36b70478f116e5de139
font_02_sfnt_off00011828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11828 16544 bytes
SHA-256: 1b44218257806f750c7fedc2cca84b6b30ff477c2da870f9e14c0541087d9c9f