Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd2da7775ece62d…

MALICIOUS

PDF

78.1 KB Created: 2021-01-06 08:57:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2031d1aff812a9b8a4389ad36d24d410 SHA-1: eac6bca2976dbc7850bdb143f77d3ed0d2d65a9e SHA-256: 0fd2da7775ece62dc26304f1762a080356d79ea60c462b612e806b6d50a5b8c6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. ClamAV detected this as a phishing trojan, and ML classifiers also flagged it as malicious. The primary function appears to be redirecting users to other sites, potentially for SEO manipulation or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/aws?utm_term=rom+android+9+samsung+j7+prime PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5f87485c649ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370077/normal_5fdd031296588.pdfIn PDF document text
    • https://cdn.sqhk.co/vakiduju/FZjfG1M/snake_vs_block_power_game_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lodikorep/gdgh5UQ/classlink_launchpad_okaloosa.pdfIn PDF document text
    • https://nifazupu.weebly.com/uploads/1/3/4/5/134507595/9540e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378619/normal_5f8b4ed791ebd.pdfIn PDF document text
    • https://dotaterezisal.weebly.com/uploads/1/3/4/7/134771172/f26c0938.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445731/normal_5fb56c9bf2954.pdfIn PDF document text
    • https://pazonijozofax.weebly.com/uploads/1/3/1/6/131606668/4585795.pdfIn PDF document text
    • https://lapomuxonadaxo.weebly.com/uploads/1/3/4/5/134584049/wutowesuvemogififu.pdfIn PDF document text
    • https://pusugokejetajek.weebly.com/uploads/1/3/4/7/134765622/f0c4ccac5c6febf.pdfIn PDF document text
    • https://gefozusep.weebly.com/uploads/1/3/5/3/135346228/rifemow.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/47071f27-e255-469c-8f6b-11256101102c/32893219737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d80c42c-aa04-4662-9903-83e3faad7200/como_se_forma_el_sistema_solar.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_off0000f3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 5568 bytes
SHA-256: b985eb9ae85eefb2286a0c3a7a942ada8aa42b94eb1c2ad883079d5c29b0acc1
font_01_sfnt_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 10304 bytes
SHA-256: 60350f2d4ccb209986b085e070990eaffd26f5c356bb79a5c7cf7faac436e46b

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