Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f0bca4129d4acb…

MALICIOUS

PDF

78.4 KB Created: 2021-04-07 16:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e2e4751108e31ac934435e7f54b8c78c SHA-1: 1927f7e3948da01e201d654d63b5abfd89d852ac SHA-256: 33f0bca4129d4acb1574d00293f5f4479462a0032e7d0ddf3a1aadbc870d0222
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/wix?keyword=kodi+tv+17.6+apk+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374978/normal_604468a03f7ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484835/normal_600bc39d65a30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489992/normal_6067d46148902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_602965c375d37.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/Ehhicih/nfl_games_today_on_tv_schedule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370541/normal_604cdfec3fddc.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/3iegdji/famijegutajeveto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444356/normal_5fe8bcbba8a01.pdfIn PDF document text
    • https://cdn.sqhk.co/xejadukoxeta/ghhilfR/dakabej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383128/normal_602b5fe68d3cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493890/normal_602435c7319ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f2fffe36-c7b4-4b88-9608-518dc6c14750.filesusr.com/ugd/950b2a_258378e00b4a415ebb796750d691e04a.pdf?index=trueIn PDF document text
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_c477c02fdbba4fdca6bfa9a0daef837c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farezelof/44590192495.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/36989226498.pdfIn PDF document text
    • https://66166ed5-207d-48ad-a5ac-83b7e977862f.filesusr.com/ugd/0d0d42_25fb0d0b87b34b81b029e27b875de450.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/donake/apr_company_full_form.pdfIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_11511409292546288f5da22007b7e0f0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paropabaru/79202638351.pdfIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_d7ec7afc28414e42a6590e5e03f68a97.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pogolo/wawarevinejemuneforirij.pdfIn PDF document text
    • https://770603ce-cae8-48b7-b4e8-6e15b9dac1cd.filesusr.com/ugd/e975af_93fa0efc3b3c4ddf81b322667cb2203a.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_off0000f5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C7 5180 bytes
SHA-256: 542c4126d71f8ec62a41e385a10a157816feebe68358f7919af24b65738f996d
font_01_sfnt_off000107a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A1 10068 bytes
SHA-256: 0ed58fd7ef8c203d6a4ef8dcb66643c68f9dffad8f133e26b61218b9f6b38c9c