Malicious PDF — malware analysis report

Static analysis result for SHA-256 225163e6c9b9ed6a…

MALICIOUS

PDF

67.3 KB Created: 2021-03-30 13:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 842e8956b3be95c9f6b7ce08109ac121 SHA-1: a4db2e16fc386078a81b7b9c2e19053092a3052c SHA-256: 225163e6c9b9ed6a6d7ef1548d9dd2d4bac56186317220eb96929b111092302f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. These links point to various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/award?keyword=antennas+and+wave+propagation+lecture+notes+pdf PDF link annotation
    • http://wiinorama.website/defiant_spin_to_lock_electronic_deadbolt_instructionsndcnm.pdfIn PDF document text
    • http://ctuxuu.com/anemia_diagnosis_guidelinesoxsvs.pdfIn PDF document text
    • https://redobalopubijav.weebly.com/uploads/1/3/1/3/131380120/193963.pdfIn PDF document text
    • https://perikoweb.weebly.com/uploads/1/3/5/2/135297066/7906442.pdfIn PDF document text
    • https://bakinoxeveraj.weebly.com/uploads/1/3/0/9/130968963/kalovi-zebawise.pdfIn PDF document text
    • http://kvrovk.xyz/fafosukamefararunupokd7hk.pdfIn PDF document text
    • https://fimosezit.weebly.com/uploads/1/3/0/7/130775491/13714c1.pdfIn PDF document text
    • https://cdn.sqhk.co/fepefudasor/wjjahc8/smash_ultimate_hitboxes_are_broken.pdfIn PDF document text
    • https://tokenabasefegaw.weebly.com/uploads/1/3/3/9/133999291/7936402.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/idhjlhc/mipatubasuvatoraxiboxom.pdfIn PDF document text
    • https://nuguviroguzemek.weebly.com/uploads/1/3/1/0/131070089/donud-fugikikewux-jigatura.pdfIn PDF document text
    • https://pexevirojaloko.weebly.com/uploads/1/3/4/8/134882405/buxegosapoxodi-zefidolozepugo-kidikidiwu-timoxorujus.pdfIn PDF document text
    • https://cdn.sqhk.co/kusedesomawa/aGhe0g6/16150586290.pdfIn PDF document text
    • https://fesogewil.weebly.com/uploads/1/3/6/0/136097302/luvitexitusuxif.pdfIn PDF document text
    • https://mobinefoju.weebly.com/uploads/1/3/1/3/131398425/9040272.pdfIn PDF document text
    • https://gadabuji.weebly.com/uploads/1/3/4/7/134715747/xuvekamutili_nusok.pdfIn PDF document text
    • https://nipetetoxijekuj.weebly.com/uploads/1/3/4/7/134718304/3902027.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/mafavuzenoliki/apache_ant_jar_file.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/boutonniere_deformity_orthobullets.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/viniminatixe.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_off0000ca3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3F 5464 bytes
SHA-256: a38f0a91402467b007627a727324a1cf4b7f41495dd5d3919364f5e900d266ab
font_01_sfnt_off0000dd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD02 10208 bytes
SHA-256: b9536f3b612548b2663f81e22de70cd25e9ec669befddc6f5608602977f8f516

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