Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d04d6e1aeab0ea…

MALICIOUS

PDF

67.1 KB Created: 2021-06-02 22:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b14434dc324bbb47236641c34e3e7d6c SHA-1: ca6a7379fed2663a5b26ac4464be8a06fbe11bcb SHA-256: a6d04d6e1aeab0ea4ae30cb6b4ed20ba3e11190f4c2f7a08d292da137f732545
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as a link farm and by ClamAV as a phishing trojan. It contains numerous external links, many pointing to disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The embedded content appears to be obfuscated, but the overall structure and URL patterns strongly indicate a phishing or SEO spam campaign.

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://oniceh.ru/pbw?utm_term=how+many+members+are+in+the+kpop+group+seventeen PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375886/normal_6019281b987ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376103/normal_5fdda02eafc36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369182/normal_6032d20fb35e8.pdfIn PDF document text
    • https://bekariniwoxisit.weebly.com/uploads/1/3/2/7/132710774/lejadoxewejubevufig.pdfIn PDF document text
    • https://zegepefuloruwan.weebly.com/uploads/1/3/4/0/134012378/6564025.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393511/normal_5ffcefc2bd6f6.pdfIn PDF document text
    • https://poriveba.weebly.com/uploads/1/3/4/3/134316211/4301106.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4486548/normal_60b1ec7f57478.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443619/normal_6048e24f0f261.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408992/normal_5feb9f6835ea6.pdfIn PDF document text
    • https://nelubetif.weebly.com/uploads/1/3/5/3/135322580/vomenuli.pdfIn PDF document text
    • https://jinozotu.weebly.com/uploads/1/3/7/5/137507520/a5bf18dcf8b5a.pdfIn PDF document text
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/7ece4.pdfIn PDF document text
    • https://geroguvipem.weebly.com/uploads/1/3/4/4/134465684/totixok_kebapekirona_bakixadefa_pewevozojivexaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501962/normal_5ff80837decaa.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/9a337998-eec0-40a4-a0bb-7223e6ea2314/labinexegavuvesabezum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c311660d-ddf0-462b-ad31-8bfd2a4b826c/fofilaxebove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d66ebd9-ac6f-4950-9c66-6bef489c3608/mathematical_induction_examples_in_discrete_mathematics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca44a447-b401-4755-8de2-f31b65575154/sanukolesitakevija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d363794d-1269-48c2-8976-fddc044c948c/68656997335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8e2dc39-7efe-49cd-97e6-82ade302e148/57381339468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a89d27e4-097b-41b6-a64b-6ba2e506cdf2/70208513510.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_off0000c85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85C 5620 bytes
SHA-256: 205ee2c3173a6a3442879593e9c1ddeeeff70faf4555148337c1b3d43a1da484
font_01_sfnt_off0000db63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB63 10372 bytes
SHA-256: 5b067f3392fe89372f04239b470eebd2369f3f0c521f0ce4bd190956f09a49b4