Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11f96f4071f8527…

MALICIOUS

PDF

73.6 KB Created: 2021-03-01 04:31:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 59703e96f28e451cce01c6f5d6f3420c SHA-1: 338322ad4050bc25a2a57d213a6f00b7fffb8551 SHA-256: c11f96f4071f8527936bf474b2e9842b6a5d519c7198ef5e57397b44a60beff4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to 'maintenance engineer' roles, likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=how+to+become+a+maintenance+engineer PDF link annotation
    • http://xibawolafubiz.getenjoyment.net/51209747495.pdfIn PDF document text
    • http://leomannapov.com/85412838401yvt0m.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/21107971405.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467955/normal_5fd38c159f845.pdfIn PDF document text
    • http://feruwikabi.iblogger.org/sasewalubijezujewufenuzal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386363/normal_6032f5a74f22f.pdfIn PDF document text
    • http://xitawefavam.medianewsonline.com/how_to_use_dive_table.pdfIn PDF document text
    • http://jolijivik.scienceontheweb.net/42035032267.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412889/normal_5fcb42583760b.pdfIn PDF document text
    • http://krokoboko3.xyz/jibafakaxivagubizegekix715bu.pdfIn PDF document text
    • http://itfamily.pro/dog_friendly_beaches_near_merkb3l.pdfIn PDF document text
    • http://tamakar.xyz/identify_slope_and_y_intercept_worksheetr4w46.pdfIn PDF document text
    • http://welitizenowem.mywebcommunity.org/firolibatuxotupex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/d-link_dir-890l_ac3200_router.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_off0000e3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E9 5100 bytes
SHA-256: 930bceb70d784cb3906270d01ee252eb2d6b951ecb019ec2f67f20f4c7bf5c57
font_01_sfnt_off0000f53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53D 10544 bytes
SHA-256: 63160d13ff601d2d674bafe45036a448800a2bd6545cc5bf34be165c41b519b6

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