Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd0ecc4a3852aee…

MALICIOUS

PDF

72.8 KB Created: 2021-04-14 22:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: dabb3cda6f7341ea8ff8e22d9b8ac735 SHA-1: e29fda37154fdf895bf84fa752818cccf3d3795a SHA-256: 4cd0ecc4a3852aee347c2d509af0933c3b64bcecdc24433200e91043d8b4a3cf
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a redirector for a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to a book summary, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=argonauts+of+western+pacific+summary+for+book+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388416/normal_601c618992c00.pdfIn PDF document text
    • http://zarumesa.mypressonline.com/52555551500.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/if5gejb/lokesasudejilomadurotizu.pdfIn PDF document text
    • https://cdn.sqhk.co/bidusowo/n3tgejf/napareruzo.pdfIn PDF document text
    • http://wedusik.iblogger.org/fly_or_die_bass_trombone_sheet_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412896/normal_604234a0e3e16.pdfIn PDF document text
    • http://zejadovota.iblogger.org/14305337945.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412773/normal_60391720559e3.pdfIn PDF document text
    • https://cdn.sqhk.co/kamufegoke/jbjhjeg/download_ice_age_village_mod_apk_rexdl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lolunoxij.myartsonline.com/34645860763.pdfIn PDF document text
    • http://xamopogowidori.rf.gd/amu_bums_application_form_date_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/the_age_of_reason_by_thomas_paine_read_online.pdfIn PDF document text
    • http://telomilabevi.epizy.com/wakulobitemejek.pdfIn PDF document text
    • http://kegebezevenaku.epizy.com/types_of_anchor_bolts_for_concrete.pdfIn PDF document text
    • http://somujewod.rf.gd/86973397180.pdfIn PDF document text
    • http://saboveliga.myartsonline.com/tell_me_about_yourself_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/champcash_pro_apk.pdfIn PDF document text
    • http://fudogupadi.rf.gd/zimowuvuwisapokimotum.pdfIn PDF document text
    • http://wiwosotu.myartsonline.com/43986663586.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_off0000ddcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCD 5748 bytes
SHA-256: 962b940df3bf3e5652b0b0f8f709502777fe9f6084a5a92cb2086e926f3685f0
font_01_sfnt_off0000f174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF174 10628 bytes
SHA-256: 2f3c1b8390623d1b8d03ef4bdab89044301da27384654399699e0258aaff7948

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