Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3db5926b8cf5ba…

MALICIOUS

PDF

85.7 KB Created: 2021-02-12 12:16:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4ca303153eb4c48fc2be12e71663bb63 SHA-1: 1ad681bf74132e2764f584c589fd7abd607858ad SHA-256: ad3db5926b8cf5bac4db2fbe1ee3d95d1c84e1ba1ecd41067ec19164eb622a1f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDFs, suggesting a link farm or a method to distribute further malicious content. The primary URL appears to be a lure, presenting a search query to entice clicks. ClamAV and ML classifiers strongly indicate maliciousness, and the PDF structure with many external links aligns with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jacksth.ru/wix?keyword=resonance+and+guitar+strings+physics+classroom+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368763/normal_601708835556b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387709/normal_5fcfadc27e759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421050/normal_5fdb69642a55e.pdfIn PDF document text
    • https://fogebutozedelig.weebly.com/uploads/1/3/0/7/130776223/7470762.pdfIn PDF document text
    • https://bopelesi.weebly.com/uploads/1/3/0/8/130874615/f7f980fdf4e9b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420748/normal_5fd7df60d8aea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479213/normal_6005f1f0407b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373526/normal_6021ed51dde71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384650/normal_5fe60f180d1d3.pdfIn PDF document text
    • https://cdn.sqhk.co/xedogigiloli/dhchehc/swing_states_definition_english.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382406/normal_5fe7ab4befee2.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/dozore/numivamefajadafexofasax.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/media_player_classic_vlc_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/ahmadiyya_usa_nikah_form.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_off000112a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A8 5688 bytes
SHA-256: 330e371921630234b2b42f348ede7378159a981cc84ed9018a69e9f94026c42a
font_01_sfnt_off000125fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FA 10316 bytes
SHA-256: 695a7372af7ba9044182dbfcd595a00fb0c2395075b4c72c89e8382afc72c2a3

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