Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbc8414b1bd1172…

MALICIOUS

PDF

134.1 KB Created: 2021-02-24 06:01:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: fca0d8d360bfb0ca328a3a428485d949 SHA-1: b5dbfd61a45ed4c1a84ed52e12f172be06c9a2b9 SHA-256: 0cbc8414b1bd1172d0ac728469e1bf7ebf51c1c6293212ead1ca51d8cbd87dc7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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=troy+township+wi+zoning+map PDF link annotation
    • http://esplus.pro/can_you_take_the_asvab_online_at_homepgt3p.pdfIn PDF document text
    • https://tavulejitozusol.weebly.com/uploads/1/3/0/8/130873759/8970849.pdfIn PDF document text
    • https://jolevodib.weebly.com/uploads/1/3/1/6/131636654/govefijuvafesuwitida.pdfIn PDF document text
    • http://littlenat.space/el_nombre_del_viento_patrick_rothfuss_trilogialq9hs.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/ivjcjj6/free_love_songs_ringtones_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/pifixijowoka/cUjbagc/puzz_3d_disney_castle.pdfIn PDF document text
    • https://cdn.sqhk.co/lokojagivel/ejd2cUi/sepang_motogp_schedule_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385014/normal_60334fa9518db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410414/normal_6032a8d37675b.pdfIn PDF document text
    • https://zadopelujon.weebly.com/uploads/1/3/4/8/134884154/nurilamozudali.pdfIn PDF document text
    • https://voxomusixexuso.weebly.com/uploads/1/3/4/8/134851372/siniju.pdfIn PDF document text
    • https://cdn.sqhk.co/pevejotomoma/9hcWkih/falling_ball_equation.pdfIn PDF document text
    • https://cdn.sqhk.co/dukizukijire/fri95jj/8_ball_pool_glitch_pc.pdfIn PDF document text
    • http://govnososal.xyz/ear_infection_in_dogs_causing_paralysis9pisl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453730/normal_600992860f04a.pdfIn PDF document text
    • https://cdn.sqhk.co/detokelixipi/jcgjXii/dozuwoliwaritizaneme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482012/normal_601534dc051bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001d26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D26A 5396 bytes
SHA-256: a67e1c4031c6568ed6f29bb1feffa1ef939100d5b10643a09d3c47e974720003
font_01_sfnt_off0001e4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E4BB 11448 bytes
SHA-256: ead90e76f56c754a72bb6357de03d60750813b3aca564f7b2159e9bd85653327

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