Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf5b8ec56cd6534…

MALICIOUS

PDF

73.9 KB Created: 2021-06-12 09:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 082deddb1998a9c84bc90faad6100449 SHA-1: d2e8ddefa4bf65af0bd4fa8eb1dd146c8dd06100 SHA-256: 0cf5b8ec56cd653439c9d772c38d19fe5d5c81a2d24698f74accc573a3fdc052
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or content aggregation for SEO poisoning. The primary URL, 'https://allytemp.ru/pbw?utm_term=vampire+academy+5+pdf', indicates a lure related to a popular book series, likely intended to attract users seeking the PDF. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/pbw?utm_term=vampire+academy+5+pdf
    • https://cdn-cms.f-static.net/uploads/4422180/normal_6027f4e8a6a58.pdf
    • https://mopirolelawa.weebly.com/uploads/1/3/4/0/134012876/3b2afaab26828.pdf
    • https://cdn-cms.f-static.net/uploads/4493920/normal_601dbaf521f36.pdf
    • https://cdn-cms.f-static.net/uploads/4466364/normal_606c56de648d8.pdf
    • https://cdn-cms.f-static.net/uploads/4445106/normal_606c91788e132.pdf
    • https://static.s123-cdn-static.com/uploads/4445881/normal_5fc73a94ae97d.pdf
    • https://fojiwuduz.weebly.com/uploads/1/3/5/3/135309278/sotatufonujetavekofa.pdf
    • https://bubefotuline.weebly.com/uploads/1/3/1/4/131438432/zamaviga_radam_bodasalenugure_lanifugiba.pdf
    • https://jinuwipalo.weebly.com/uploads/1/3/5/3/135332432/bawabuzotusisew-fozagofiwujoboj-garumanekija.pdf
    • https://cdn-cms.f-static.net/uploads/4485450/normal_6050fe04ecb7c.pdf
    • https://cdn-cms.f-static.net/uploads/4371498/normal_602a92b8c2f0d.pdf
    • https://cdn-cms.f-static.net/uploads/4375521/normal_5fd5fd4e59b73.pdf
    • https://cdn-cms.f-static.net/uploads/4373770/normal_605191ed6aef3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rilewikem.pbworks.com/w/file/fetch/145051572/88432669993.pdf
    • http://letonepamusi.pbworks.com/w/file/fetch/144648432/86298629516.pdf
    • http://sejiliki.pbworks.com/w/file/fetch/144547095/how_to_remove_ideal_standard_concept_toilet_seat.pdf
    • http://pizuwamamevu.pbworks.com/w/file/fetch/144950022/davapisu.pdf
    • http://kiwuwas.pbworks.com/w/file/fetch/144617100/how_to_use_a_bella_belgian_waffle_maker.pdf
    • http://fuzugimife.pbworks.com/f/99998319013.pdf
    • http://sowenux.pbworks.com/f/rutipejomizutetojiguf.pdf
    • http://ginosofep.pbworks.com/f/diamond_ongeza_bado.pdf
    • http://fukibaso.pbworks.com/w/file/fetch/144751281/site_de_telechargement_film_gratuit_avec_utorrent.pdf
    • http://pazimonofe.pbworks.com/w/file/fetch/144672858/xusujazuvelubeza.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f4.bin
db5d5af8419fb3e67a2a6e294ba83c8370b38a39de605196657340e9bef02886		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F4 5280 bytes
font_01_sfnt_off0000f3e7.bin
b83b0a604f391713ea91d0ea7b4204b1ac9c81ef8c45fe4c8f7a29b237a073f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 11252 bytes

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