Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a539f9b4c5a858c…

MALICIOUS

PDF

74.4 KB Created: 2021-03-28 08:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4bcdc482cc41db51beeec9fd7f6dd278 SHA-1: 1cd92451f55ce33f0c1b51066aab890194d23479 SHA-256: 9a539f9b4c5a858c701682137f8153301a24ca5c53d1b26c243083b92cc99d36
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating a deliberate attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://leonvi.ru/strik?utm_term=the+silence+of+the+lambs+3 PDF link annotation
    • http://7lessons.site/cool_easy_fingerpicking_guitar_songs75p59.pdfIn PDF document text
    • https://wigufigavotafo.weebly.com/uploads/1/3/1/4/131452860/5170998bda9d6b.pdfIn PDF document text
    • http://bnl-jobs.com/5722452546364zii.pdfIn PDF document text
    • http://masovizifuzaro.iblogger.org/12390834863.pdfIn PDF document text
    • http://jobauthor.online/cargill_inc_financial_report_2018qxhg5.pdfIn PDF document text
    • http://kafalogu.22web.org/best_heated_mattress_pad_queen_dual_control.pdfIn PDF document text
    • http://sallely.xyz/86274745628rd90y.pdfIn PDF document text
    • http://lnstagram-office.com/metel_horror_escapexgxdr.pdfIn PDF document text
    • https://biwezufum.weebly.com/uploads/1/3/4/8/134872286/tovagoti.pdfIn PDF document text
    • http://masajsalonunuz.com/anemia_falciforme_sociedad_espaola_de_pediatria6b35x.pdfIn PDF document text
    • http://zuvels.xyz/15703780830s2ocq.pdfIn PDF document text
    • https://tivagirususu.weebly.com/uploads/1/3/5/3/135350390/zakukebis.pdfIn PDF document text
    • http://zinobinipote.22web.org/divinity_ii_original_sin_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460682/normal_6034fa2d1a23e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403260/normal_601c71a5b14b7.pdfIn PDF document text
    • https://fomomeku.weebly.com/uploads/1/3/2/7/132712435/cc8c17fa744a796.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500186/normal_5fcd94dad26d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mukesul.epizy.com/chaconne_guitar.pdfIn PDF document text
    • http://dexifuv.epizy.com/magnetrol_guided_wave_radar_level_transmitter_706.pdfIn PDF document text
    • http://rexenejo.epizy.com/cours_de_grammaire_francaise_en_ligne.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_off0000e22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22C 5276 bytes
SHA-256: 47afd6a766ee2cdeae3d84023ae1e5792d1b6610506be42b45ac0322100ef14f
font_01_sfnt_off0000f3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FE 11936 bytes
SHA-256: 10b0f837cddb868692b889ea987dca53f29d9ebb71cae8c8b83e1ffbd6a56616

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