Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2fa7e51055ce3b…

MALICIOUS

PDF

77.2 KB Created: 2021-03-30 16:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 58769702eccbd7c6cd9d81ea622d44c7 SHA-1: 5a50cbe9dfc109cbd45eb619dc7963b82ac3d4ed SHA-256: 6b2fa7e51055ce3b4fe4e9a0eeb281f339dc8d12662d169d9a5b8181ae4b581d
126 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URIs suggests an attempt to redirect the user to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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=is+cbd+oil+illegal+in+ncaa PDF link annotation
    • https://mubuzetuwifo.weebly.com/uploads/1/3/4/7/134703000/7889554.pdfIn PDF document text
    • https://cdn.sqhk.co/befulirawid/FjecyMj/89732620642.pdfIn PDF document text
    • https://baxorejo.weebly.com/uploads/1/3/5/2/135295822/4027240.pdfIn PDF document text
    • https://cdn.sqhk.co/mozoposowi/jgGggHt/set_individual_ringtones_galaxy_s9.pdfIn PDF document text
    • http://kengoru.space/carrion_crown_pawnsi0m2q.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/8WWRgi8/wish_merchant_app.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/VHpvifU/abalone_game_marbles.pdfIn PDF document text
    • https://sopunarexij.weebly.com/uploads/1/3/1/8/131857112/1409586.pdfIn PDF document text
    • https://rilavowa.weebly.com/uploads/1/3/2/7/132740415/3150168.pdfIn PDF document text
    • http://dragonflysagewellness.com/jebigomasororugepuwuikinm.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/7TQjdhd/movie_matinees_today_near_me.pdfIn PDF document text
    • http://grafoanaliz.ru/navy_e7_advancement_resultsgzqyz.pdfIn PDF document text
    • https://cdn.sqhk.co/xekejegixawo/icibFhd/44754883845.pdfIn PDF document text
    • https://cdn.sqhk.co/xaxovowupofa/3oiggja/vakajimefipoxufadobap.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/jaamhgM/63466424827.pdfIn PDF document text
    • http://fumigatoff.online/12070201682951o4.pdfIn PDF document text
    • https://cdn.sqhk.co/gijesali/biejfdK/daily_contacts_for_astigmatism_cost.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/piradi/what_does_the_uncle_sam_symbol_represent.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/muvosedoxizagag.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/nerusovu.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/40190332302.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/genizeta.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/que_es_un_anticoagulante.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/tisizapuxupojo.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/dozepovi.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_off0000f12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12D 5088 bytes
SHA-256: 1610af358f7cc8c1d34da912864eee1199a5c532cf6cee3f30a2f0a1b8b3d43a
font_01_sfnt_off0001028b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028B 10744 bytes
SHA-256: bc33886ef5f631d75af63227efe7bf14d9e97d963928bdd295ed8f53d0a6cd78

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