Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bec5dd2f68a72f1…

MALICIOUS

PDF

80.1 KB Created: 2021-03-08 20:27:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a7ac9118784a096532acc9ebf985d7f1 SHA-1: af9260c48c4b3d8e6b3339bd194bfdac2773aee0 SHA-256: 5bec5dd2f68a72f19e095f05301d3709f7db5d1385f210b2ee9e5a0758d572ee
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external websites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to lure users to malicious sites.

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://kuzutuzo.ru/award?keyword=contending+for+the+faith+pdf PDF link annotation
    • https://pejapuvurexoku.weebly.com/uploads/1/3/1/6/131636728/karexobilukefo.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/71534834012.pdfIn PDF document text
    • http://hargotel.xyz/gadgets_360_tv_reviewx8m66.pdfIn PDF document text
    • https://wosudinaxek.weebly.com/uploads/1/3/5/2/135299586/xexuriwimijeku.pdfIn PDF document text
    • https://tubozabuzimez.weebly.com/uploads/1/3/4/8/134878922/1001324.pdfIn PDF document text
    • https://zetoruribafepa.weebly.com/uploads/1/3/1/4/131452904/sutumuzatekekok.pdfIn PDF document text
    • http://anbieterbewertung-autoscoutch.com/15615120632qve0s.pdfIn PDF document text
    • http://alexandreablog.com/fomudazujigomutisipilefnbo5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422371/normal_601cf150b7387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490974/normal_60414670dc65e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410418/normal_5fcf483094bab.pdfIn PDF document text
    • http://sehq.xyz/58487140563oejxq.pdfIn PDF document text
    • http://girlsbeach.space/best_jump_scares_on_youtubewwqal.pdfIn PDF document text
    • https://kojulijorivo.weebly.com/uploads/1/3/4/3/134329781/4685013.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/24985162053f8xjf.pdfIn PDF document text
    • http://keto-s1.com/abc_of_english_literature_book8h3fu.pdfIn PDF document text
    • http://gakmancreatures.ru/anemia_falciforme_pode_causar_leucemia267bl.pdfIn PDF document text
    • http://rasidafepu.mypressonline.com/47220153402.pdfIn PDF document text
    • http://bilkan.fun/what_do_you_use_a_mini_crock_pot_forcv7ch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369334/normal_5fd61e9a1d8f9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 5000 bytes
SHA-256: 727a60a1eed038970ac4bddc06f8fb22a4573addf4367ac27a87817028e0424b
font_01_sfnt_off00010ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCB 11388 bytes
SHA-256: 33643e9090ec4e3419a9407988619902f1b88c75caeb4e901e9ad24d187cd70a

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