Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd5d8c434ab42f87…

MALICIOUS

PDF

86.5 KB Created: 2021-04-01 20:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2059d861c432939e258dfcde66133008 SHA-1: b09295b8cdf2c7f78ed993ab16699e111e92167b SHA-256: fd5d8c434ab42f87fd47dae665746e80b75376e1ba3af3e133deb330f19ef548
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/award?keyword=continuous+probability+distribution+examples+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466146/normal_604e14ba43f38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477164/normal_6014fb85e6704.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407804/normal_5ffc780943f4e.pdfIn PDF document text
    • http://tulalenabeparuk.iblogger.org/facebook_cover_template_ai.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425919/normal_606008e859f5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366662/normal_600b673a27c91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417675/normal_605029eb932d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413110/normal_604506065933b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452624/normal_5fcbc9ea48084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417046/normal_605f70c10fd56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456699/normal_60224ea13cf74.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/ddf64634-ecb4-4b9f-b98f-8b837d1b6b86/30967499661.pdfIn PDF document text
    • http://gadudadu.rf.gd/maniwetexuxopag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76e45933-ee43-486a-bba2-2d7bd5acf4a0/que_es_una_forma_farmaceutica.pdfIn PDF document text
    • http://xesesezaxemu.epizy.com/verifujodapom.pdfIn PDF document text
    • http://sinejelubomidi.epizy.com/lobuvulurasekivusisoxir.pdfIn PDF document text
    • https://bb209e34-24c3-4901-88bd-c00af8cda710.filesusr.com/ugd/de6798_8d11c20d223248c19f0638db7326eca6.pdf?index=trueIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_d104cfc4a3284fdc901e8e657f03396b.pdf?index=trueIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_5abb6555eb1546f4800a1731468aa3bb.pdf?index=trueIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_24d237ae17f341bba19549f11cbdfb71.pdf?index=trueIn PDF document text
    • http://muzowagujojate.rf.gd/all_my_friends_say_its_over_mate_lyrics.pdfIn PDF document text
    • https://6674166f-eb58-46b1-9d38-a528bc95e02c.filesusr.com/ugd/e38d8e_7be32e47f31e4177837c7c1a4852b0eb.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
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 5404 bytes
SHA-256: dac2fa9a293bafee0989da7d532da3da8c751ceb48539b3e04afa6144e6c1a6d
font_01_sfnt_off0000fe54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 6196 bytes
SHA-256: c17185fff704997b3fd760650c7615a7730c328df517181063df9db26e678e0e
font_02_sfnt_off00010d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D53 11876 bytes
SHA-256: 5fdbc071cd2d9e912fd85d923694511f389a865ce0a8142449fba2e6c5703372
font_03_sfnt_off00013606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13606 16288 bytes
SHA-256: fa8a0c21d540711d17b39c9445762ea8bcda287abb9c222c763c9cee65582c9e

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