Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a9817bd716fae6…

MALICIOUS

PDF

83.6 KB Created: 2021-04-12 16:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 435d899d2d7231902c9f9b6c91af2848 SHA-1: 226566260b7ecaacf516daf06b90d402852ff20c SHA-256: 31a9817bd716fae6019f1713c24a070cc157b4a13c9b0c5bf08a0ee3665d4824
186 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, evidenced by a large number of external links, many pointing to disposable hosting services. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=does+boston+market+chicken+have+carbs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4372673/normal_5feb963fdca90.pdfIn PDF document text
    • https://semitedajun.weebly.com/uploads/1/3/1/6/131636975/2232271.pdfIn PDF document text
    • https://cdn.sqhk.co/wupofolizaj/e7jhMwY/25306088243.pdfIn PDF document text
    • https://romevezijije.weebly.com/uploads/1/3/4/7/134756673/59653cf9.pdfIn PDF document text
    • https://cdn.sqhk.co/vajirasavuz/SMjhSig/88431880870.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/Ldoha4b/gaguvisi.pdfIn PDF document text
    • https://cdn.sqhk.co/ropimipaf/hiiejjm/kigokeberimuguzemipibawe.pdfIn PDF document text
    • https://cdn.sqhk.co/mamidusidozu/f0WAGay/xopagelamejuzunefokalurat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447276/normal_602475ebb5840.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474169/normal_5fee370e12fba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_8e091b578ae34e17842d39ff431fc932.pdf?index=trueIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_5ff27c989d704397ab8a62cd43455fef.pdf?index=trueIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_afa211f50df64c8c8d7820db94935b63.pdf?index=trueIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_4e8c48c474004e859f94cf6be17e64ea.pdf?index=trueIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_6a8b9629a9c94b8982dc5d49d7fda0e7.pdf?index=trueIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_63da7729be18454fb54dcfb3521537f4.pdf?index=trueIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_9efae6332b874a2f92541d49624aef17.pdf?index=trueIn PDF document text
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_3bd9c5d400c54275819c83ca2f752c17.pdf?index=trueIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_29b75dda19b8492ba17a44311c62905a.pdf?index=trueIn PDF document text
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_c594daa79abb4ad296e9a5a80d722aa2.pdf?index=trueIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_3fe298a0321b47429f0ba968e207a8d9.pdf?index=trueIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_e4bbc26f0c1e4917aab1db3da5c2f166.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_off0001078b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 5268 bytes
SHA-256: 009cee12390cf00b416d20332fc0d255d99389742b554483453aa4fc69e5d2f4
font_01_sfnt_off00011957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11957 11128 bytes
SHA-256: f851edf08cfff36648584c0441ddbfcb16ee58877d809b01592e9eb172adf0a7

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