Malicious PDF — malware analysis report

Static analysis result for SHA-256 3977fab6025347ca…

MALICIOUS

PDF

77.9 KB Created: 2021-04-07 22:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fa1911cc701a83b179eafa081d4238d4 SHA-1: 52b8d5a39f382a72cea41f90557f7028122bcb30 SHA-256: 3977fab6025347caad7a84542c81f0dd467256667d8a182a6586fcb35457240f
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 0.9996

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://lozipotod.ru/wix?keyword=manual+de+convivencia+propiedad+horizontal PDF link annotation
    • http://lisolu.org/how_to_fix_physxloader.dll_file_missing_errorju457.pdfIn PDF document text
    • http://nonretloli.site/pumetodepaxoletwywnp.pdfIn PDF document text
    • https://suxutusebosogu.weebly.com/uploads/1/3/1/3/131379987/6155404.pdfIn PDF document text
    • http://compte-cmbretagne.best/taco_bell_shredded_chicken_burrito_calories597ml.pdfIn PDF document text
    • https://zavitakeji.weebly.com/uploads/1/3/4/9/134904790/92d40.pdfIn PDF document text
    • https://wexemexaxixu.weebly.com/uploads/1/3/4/7/134709907/9f23a9cec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404488/normal_6004351a4d5ba.pdfIn PDF document text
    • http://lovemecompletely.com/sniper_training_courseo6d77.pdfIn PDF document text
    • https://kitabenulo.weebly.com/uploads/1/3/0/9/130969432/koxovebijozupa-fezizuladew-muxoxar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455381/normal_5fdc5069f2cd0.pdfIn PDF document text
    • https://bejolikide.weebly.com/uploads/1/3/1/4/131437094/muwule.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/vunizi/viwokuvonam.pdfIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_36411bc6674f45949dc92ee3fc50305d.pdf?index=trueIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_795ca56850be4e778e8e3d9872c83fe2.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_e36c8fcb42d645d6b72d274b3e6d2bb4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/retisovojor/kedge_anchor_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/45742837308.pdfIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_fe5c49f9a6d34c6fab7446c4244b36b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/jagixizuganipuvudo.pdfIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_c5dd18b6aa924f3c87620d5a09b7921c.pdf?index=trueIn PDF document text
    • https://81d89a68-18ac-4cf1-ad00-ddd5d2f7da41.filesusr.com/ugd/ed58ef_cf446c5f2e094ae7905ba6b3547d4cb0.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF207 5096 bytes
SHA-256: d78285048813643cc7be1f5745309860c0b6e5673deb8771466ac38550498f6f
font_01_sfnt_off00010370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 11764 bytes
SHA-256: f6c0f518321fd25a7d57c6c44d956971c3c4d36c8d7f88a31a880fcaeb49d8f7