Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f347650853e5e84…

MALICIOUS

PDF

95.7 KB Created: 2021-04-03 22:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2dfad4475ada3d9a25cf544b77a8d36c SHA-1: d2a9e6d9c6e98eb9091552e020eea9c0d2106f23 SHA-256: 6f347650853e5e849b7e824504c369079dbbdf9d54481496c71b61e8111db99e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware sites. No scripts were extracted, but the PDF structure itself is indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/wix?keyword=dones+y+frutos+del+espiritu+santo+para+ni%25C3%25B1os PDF link annotation
    • http://vowufijetapiko.sportsontheweb.net/jopuwuli.pdfIn PDF document text
    • https://midunaso.weebly.com/uploads/1/3/4/6/134680252/638476.pdfIn PDF document text
    • https://libepuve.weebly.com/uploads/1/3/1/4/131407284/pajifazasur-rimolisa-nugamitijilaxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472763/normal_601a9b7d1e240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417205/normal_604e842fa761f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482415/normal_60449772110f6.pdfIn PDF document text
    • https://tisexazom.weebly.com/uploads/1/3/2/6/132682329/tonutuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451369/normal_5fdfb53a4d9b4.pdfIn PDF document text
    • https://pofofeteb.weebly.com/uploads/1/3/2/6/132681268/10d1db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_661ba82ec1a34d42a6e74f7d2e696d1d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2abd5b03-245d-4875-afcd-ae9819f7e8aa/order_of_operations_maze_worksheet.pdfIn PDF document text
    • https://435a888a-8f80-410d-aa77-77edd6e4491d.filesusr.com/ugd/51fec0_ec386183b00e4e41a1a6c185994faaed.pdf?index=trueIn PDF document text
    • http://netomadutimafe.onlinewebshop.net/vovel.pdfIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_4dbaa93f8451407592b1d0907804365c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/la_tercera_impresa_reportajes.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/anemia_falciforme.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/guide_antirumore_per_tapparelle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06261382-f79e-4dae-804e-6d3bc903c5db/zemewalisukatodorufegedo.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/16574587488.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcb1157d-18a5-4a91-9815-51411eea50b6/what_is_universal_quantification_in_logic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f17fcb87-a376-46fd-9b8b-609554eed8a6/oster_bread_machine_manual_5843.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_off00013382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13382 5348 bytes
SHA-256: 4ad546d8d318cecaeab94addbcd2d7d7f280bc8b5d44d51aa4c94ee0d8647db5
font_01_sfnt_off0001458b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458B 12816 bytes
SHA-256: cc2d5eba176d9a93aa84cdbd831af67b84ab77dd44e9b242a28624abf57619df