Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a6f13488b31454f…

MALICIOUS

PDF

71.0 KB Created: 2021-03-29 07:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c79be1a8724c06f4ff2ea5e1d331af69 SHA-1: e7d59527268fa303b1314fff48984b947f3f52cd SHA-256: 0a6f13488b31454fb23aa57bcc9b474075e597cda3ae50e9d41b962d108e08fd
186 Risk Score

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://mezovuduw.ru/award?keyword=capitalismo+monopolista+e+servi%25C3%25A7o+social+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4503525/normal_600a464c12740.pdfIn PDF document text
    • http://mini-cam-v2.club/las_ventajas_de_ser_invisible_google_docs2hkt4.pdfIn PDF document text
    • https://mokizafot.weebly.com/uploads/1/3/5/3/135347773/wovinatunaleg_bitakomi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_60600411018f7.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/highjhj/10_easy_skateboard_tricks_for_beginners.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_605b6c934841b.pdfIn PDF document text
    • http://popularchoice.space/xudunuzakucl.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn.sqhk.co/kosojilufut/jbifU5U/95098447536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494673/normal_5fe94a8d7187f.pdfIn PDF document text
    • http://good-production20.site/xunukisezonuxov82rm.pdfIn PDF document text
    • https://mesirurot.weebly.com/uploads/1/3/4/7/134706751/tovupiwasaneduser.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470405/normal_5fe99f2596dfe.pdfIn PDF document text
    • https://nofuxufemi.weebly.com/uploads/1/3/2/6/132681390/saginajaguluwus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372707/normal_5ffcf52084bd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379844/normal_6027121764c6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459025/normal_6042ecfd2492b.pdfIn PDF document text
    • https://volufijipezuji.weebly.com/uploads/1/3/4/7/134703795/jedamitevososax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420756/normal_6024f7f724d7c.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/ghdVgfE/demand_note_payable_debit_or_credit.pdfIn PDF document text
    • https://gejomomik.weebly.com/uploads/1/3/4/7/134719116/sonepagaxujafapokefo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378604/normal_6052418132580.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/befafuni/jejexutibigeliligorabuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/bomiguteb.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20C 5448 bytes
SHA-256: f133ad5ff79b7faa8b545e5bf8b8379841dcf079b0fa2826d061f344ff981ccc
font_01_sfnt_off0000e435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE435 13092 bytes
SHA-256: ebc68f1a7dd69d9270404a805304ed446f63a7c4dd658da77d32f8d432eb70f9