Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29d740a52bb45bd…

MALICIOUS

PDF

99.7 KB Created: 2021-02-12 09:22:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e2d2b090dcc339d32ac7460caa2f2be3 SHA-1: 15215799c59882b9f555c8e7a8085f136eddf5c3 SHA-256: c29d740a52bb45bd77fc3cb0a0b9ad530f50aa4ca35a74f150eec32c3db18cd9
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, indicating a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The embedded URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wb?keyword=string%20format%20integer%203%20digits PDF link annotation
    • http://igrarazuma.info/chicken_business_plan_south_africazsynt.pdfIn PDF document text
    • http://beststudent.space/world_zombie_contest_hackwgt1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453329/normal_6000b43b97520.pdfIn PDF document text
    • http://itasummer.fun/can_t_hurt_me_redditssr8h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379970/normal_5fdf3b68abc3b.pdfIn PDF document text
    • https://cdn.sqhk.co/runusamopit/riiwjgj/13441232765.pdfIn PDF document text
    • http://shoop-fh.ru/7967526924ngpja.pdfIn PDF document text
    • https://kuribigewisowe.weebly.com/uploads/1/3/4/6/134688213/c930a.pdfIn PDF document text
    • https://napifilimikap.weebly.com/uploads/1/3/1/6/131606974/3476af9.pdfIn PDF document text
    • https://cdn.sqhk.co/sozovifena/gidjjqp/craft_vegas_block_craft_game.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/ahaidjf/financial_times_mba_ranking_2018_europe.pdfIn PDF document text
    • http://shop-onlinediscount.xyz/the_walking_dead_1._sezon_tC3BCrkC3A7e_dublajqe6i2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481275/normal_6025f8da00dd2.pdfIn PDF document text
    • https://cdn.sqhk.co/pawijilabu/ghicjcj/fun_facts_about_st_valentine_s_day_massacre.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/tanikanaw/oecd_guideline_no._420.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_off00014355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14355 5464 bytes
SHA-256: ed7edbb5305153ada746476294b4f75f35cd2e648074e1af19ad597120a2ecf0
font_01_sfnt_off000155cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155CC 12800 bytes
SHA-256: b8984d158b42414341bf43be6420b1c9245cc4eb5c8ec0e846a38133ac4048dd

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