Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79f08b30fa46155…

MALICIOUS

PDF

76.9 KB Created: 2021-02-16 02:51:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fa318f69ccecc14dec4f0378957edcf2 SHA-1: 0493cb0932a7348c701f04b85aa66931ca059e7a SHA-256: a79f08b30fa46155efa4274dc610c404a8ce8e9ceb43f1f6c1715ad691d3da22
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://jottigo.ru/strik?utm_term=start+my+toro+snowblower PDF link annotation
    • https://cdn.sqhk.co/xuzuvazol/ukeh3ha/2941099241.pdfIn PDF document text
    • https://cdn.sqhk.co/xurinuwame/cNICEhi/automotive_nuts_and_bolts_melbourne.pdfIn PDF document text
    • https://vusugurubem.weebly.com/uploads/1/3/0/9/130969976/zawudomutodekanilen.pdfIn PDF document text
    • https://cdn.sqhk.co/mipekakiri/dHijLhg/52921433989.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/zlgchd9/73254281733.pdfIn PDF document text
    • https://cdn.sqhk.co/merodobiweve/1ExKgjV/kabarurafazabelukoravula.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484093/normal_5ff29df398b68.pdfIn PDF document text
    • https://cdn.sqhk.co/dalubevemex/jfidUgf/59372133630.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476593/normal_600d046e2219d.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/lHTigA8/us_men_s_soccer_world_cup_qualifying_standings.pdfIn PDF document text
    • http://icily.xyz/doxurubexumugabice5vt.pdfIn PDF document text
    • https://miboxijudowisu.weebly.com/uploads/1/3/4/4/134491333/pogixowewiliwog_bafujesibagug_xuzeliwisetoduv.pdfIn PDF document text
    • http://front-glass.website/28389827851iiu82.pdfIn PDF document text
    • https://cdn.sqhk.co/naxisedomak/WxFiboG/bull_run_shooting_center_learn_to_shoot.pdfIn PDF document text
    • https://tebideronapiza.weebly.com/uploads/1/3/1/4/131483209/06aa557e.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/w1Ljejc/audio_latigo_sheldon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421464/normal_6001c208358ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386829/normal_5ffea4313d487.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/ihid6KE/70356926249.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EF 5008 bytes
SHA-256: 0c88c61b2f8cf01d13cdee9df02b24dabbe99e9b3461111ee3a37ebbc7d208de
font_01_sfnt_off0000f4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E7 10348 bytes
SHA-256: 331303fe64f2c477509bcea491dc32920a6df96c97aac160eaa63e37f32115d9
font_02_sfnt_off0001182a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182A 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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