Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed476fc266d09af5…

MALICIOUS

PDF

77.2 KB Created: 2021-02-20 16:40:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 8dc2377715c6d7c615c72bff8a3347b6 SHA-1: 44c2bf7be511195db91720331e645f5e6096d2bb SHA-256: ed476fc266d09af53302daa2f699ddc0a41e7ff6b7f470f64a9c9e23782c67bd
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with critical heuristics identifying it as a malicious redirector and a link farm hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the heuristics suggests the PDF's primary function is to lure users to malicious sites, likely for phishing or malware distribution, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=one+minute+manager+books+list In PDF document text
    • http://roxaresasupuke.iblogger.org/the_time_travelers_wife_hbo_release_date.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470977/normal_5feee22d90b00.pdfIn PDF document text
    • https://wedabivugexum.weebly.com/uploads/1/3/0/9/130968949/1234503.pdfIn PDF document text
    • https://cdn.sqhk.co/paxelababeg/gijMjgf/super_farmer_board_game.pdfIn PDF document text
    • http://bepevekebezupu.22web.org/homophones_worksheet_with_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/fieg2O9/zuxalitafisip.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/sjchagg/anime_avatar_creator_full_body_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410004/normal_5ffad201ea906.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380705/normal_5ffda3555e9f9.pdfIn PDF document text
    • http://zabidegelid.iblogger.org/how_to_try_planet_fitness_for_free.pdfIn PDF document text
    • http://kilagine.22web.org/rome_2_total_war_iceni_guide.pdfIn PDF document text
    • https://jabasamivesapev.weebly.com/uploads/1/3/4/0/134041177/76b08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446773/normal_5fc679cf0ceb9.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/kotidox/34914354482.pdfIn PDF document text
    • http://livagutavox.epizy.com/mammut_astro_guide_glove_test.pdfIn PDF document text
    • http://zudosikewemer.epizy.com/canon_eos_650d_used_price.pdfIn PDF document text
    • http://xizokokov.epizy.com/nibod.pdfIn PDF document text
    • http://banitazivi.epizy.com/hand_lettering_worksheets.pdfIn PDF document text
    • http://zurutoraxavifes.rf.gd/bomenamesuraji.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_off0000f0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F6 5236 bytes
SHA-256: 69cc410710a890d982b6dabd99f750005de9bfb62e9e6afd36a91e85cf291318
font_01_sfnt_off000102aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AA 10784 bytes
SHA-256: 9d31ad6de407e0803acf8780849f2c9036675c51857e05f6921f52be600dbb74

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