Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5734388c2467e88…

MALICIOUS

PDF

77.4 KB Created: 2021-02-22 23:50:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 23e481ba965b3453e58ea7e349632dca SHA-1: c3f17595f160966373b777c7f34a7ba1e09f915f SHA-256: c5734388c2467e88e366afa6279f73c2f8e6064a4ed7e2f6d23c50d4ea9ee2db
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's primary purpose is to redirect users to potentially harmful external sites.

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://leonvi.ru/strik?utm_term=cyberpunk+2020+wiki+johnny+silverhand PDF link annotation
    • https://zadopuvaja.weebly.com/uploads/1/3/4/8/134892734/121b72e63c4.pdfIn PDF document text
    • https://pomadiwu.weebly.com/uploads/1/3/5/3/135313662/fc6112c65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381539/normal_5fcb390fe21e1.pdfIn PDF document text
    • https://gimipozadifan.weebly.com/uploads/1/3/1/3/131380487/8859174.pdfIn PDF document text
    • https://xufujakuzizam.weebly.com/uploads/1/3/5/3/135315974/740fefcca3a6.pdfIn PDF document text
    • https://jedexapotup.weebly.com/uploads/1/3/4/4/134472831/gajimerolezo_xajiwuvigi_tumijedij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479451/normal_6025ce2c2ed18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467573/normal_600cd02dd07bf.pdfIn PDF document text
    • https://nofuzuvovakiba.weebly.com/uploads/1/3/1/3/131379181/kalatazukanu_sekejij_loxile.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wepaxilex.epizy.com/akalamagbo_video_by_bukunmi_oluwashina.pdfIn PDF document text
    • http://fidazel.epizy.com/48361209065.pdfIn PDF document text
    • http://zajozikudesurek.epizy.com/bikixuvofunixosemoji.pdfIn PDF document text
    • http://fusopub.rf.gd/cosmos_laundromat_parents_guide.pdfIn PDF document text
    • http://gegukisakewomo.rf.gd/impossible_burger_nutrition_guide.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_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 5760 bytes
SHA-256: e8873ad61fef3123e5cf6aea2ad1a88210c84d76539b5a428f1f5f672aa5f9c5
font_01_sfnt_off00010511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10511 10480 bytes
SHA-256: 092d24a81f635652fff968d7c1be1941ee799193bc720ba2c465d3b7475b9bb0

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