Malicious PDF — malware analysis report

Static analysis result for SHA-256 c896a50cf6f75f00…

MALICIOUS

PDF

75.3 KB Created: 2021-03-31 16:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 346ed87709321409e7b7bcb972770b89 SHA-1: 9f852f638592e2978fb81f09a0ddde5e9290d049 SHA-256: c896a50cf6f75f00558738d6935d7d418ec53da0cb2c4a2eb71f860975dcd3dc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://zajinet.ru/strik?utm_term=the+game+changers+book+cover PDF link annotation
    • https://cdn.sqhk.co/libewepigux/b1KBCzh/27541831668.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493209/normal_5fe047ea5e62c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465277/normal_5fc9fbe89897c.pdfIn PDF document text
    • http://wadopipojadali.iblogger.org/vastu_shastra_2_full_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/fugolamudara/fibTiii/steel_ball_run_2nd_place.pdfIn PDF document text
    • https://cdn.sqhk.co/sirojenu/dgejjje/joxokamukukitajinovuwone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444852/normal_603ea04fd5c19.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dojeranorered.epizy.com/bekhayali_me_bhi_tera_flute_ringtone.pdfIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_ce3f109f9b9c4004b0ef552bcc6ccaee.pdf?index=trueIn PDF document text
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_013f5e438e7840f89c2dac676780b7c1.pdf?index=trueIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_2a0588a1b7f24bb2a0885362d89331b5.pdf?index=trueIn PDF document text
    • http://jakezijaredu.epizy.com/what_is_the_difference_between_realism_and_naturalism_in_literature.pdfIn PDF document text
    • http://wobagelamabix.rf.gd/rt-n66u_alternative_firmware.pdfIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_e440c9b142834f53891cfdcf913e8622.pdf?index=trueIn PDF document text
    • http://momebemobife.rf.gd/40923741490.pdfIn PDF document text
    • https://19527f6f-7821-4b33-8e58-d909ab9a203f.filesusr.com/ugd/b18fc6_9de88d657b0e4f448ec47b50942c2333.pdf?index=trueIn PDF document text
    • http://zetowimular.rf.gd/antibiotic_prophylaxis_dental_guidelines_2019.pdfIn PDF document text
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_3a4ae76372e347e2a015e38359fa6e29.pdf?index=trueIn PDF document text
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_45b661bb65da4d0f82566628a76edbd6.pdf?index=trueIn PDF document text
    • http://bewosekoxosegoz.rf.gd/africa_toto_sheet_music.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_off0000e781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE781 5396 bytes
SHA-256: 0fd5a3ecc914b242a30ee1b12147e96bad713c63e66576126ac2cb33e8fdea63
font_01_sfnt_off0000f9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B9 11424 bytes
SHA-256: 6d67a31ba1e67b4c2343740318c54946a046be5cfa2d1b00ee1ed819c6588994

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