Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5aa4376c4ed4ca9…

MALICIOUS

PDF

92.1 KB Created: 2021-03-13 21:32:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a2b6b05a0a238625bdd60a3a6f020bd SHA-1: db50bb69f2c5feaac098c0879d44bb5da0cc065a SHA-256: c5aa4376c4ed4ca9b0397aaedb242fa569faaa234fe884bf3a31343b21cab3e9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism for distributing malicious content. The document body, though partially corrupted, contains references to legal procedures and the wkhtmltopdf tool, which could be used to disguise the malicious nature of the links. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to drive traffic to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=what+is+rule+11+of+the+federal+rules+of+civil+procedure
    • https://cdn.sqhk.co/nugizape/d1Qgj5p/43079247028.pdf
    • https://cdn.sqhk.co/luwukamuku/mwhhHhh/world_war_z_2_game.pdf
    • https://cdn.sqhk.co/xemugugafot/UibCzha/ravens_steelers_prediction.pdf
    • https://xefujalebide.weebly.com/uploads/1/3/2/6/132681694/4342768.pdf
    • https://jasenumuruj.weebly.com/uploads/1/3/5/3/135309327/zabajufuwun.pdf
    • https://cdn-cms.f-static.net/uploads/4476418/normal_603fc2b79648e.pdf
    • https://cdn-cms.f-static.net/uploads/4474220/normal_5fd1c2d6bb1aa.pdf
    • https://cdn-cms.f-static.net/uploads/4370740/normal_603d00cdea22d.pdf
    • https://cdn.sqhk.co/duditizonut/ikYgchb/netflix_stock_drop.pdf
    • https://rudunusom.weebly.com/uploads/1/3/4/6/134602981/bc6d7efc.pdf
    • https://cdn.sqhk.co/dofewijoras/iajahYT/43871730967.pdf
    • https://judavolegarar.weebly.com/uploads/1/3/1/8/131871921/8569a7d378c3ab.pdf
    • http://zokazurimila.mygamesonline.org/xenizozunesukenixorigu.pdf
    • https://cdn-cms.f-static.net/uploads/4495985/normal_6049e36609a09.pdf
    • http://pazolozul.mypressonline.com/flight_training_manual_download.pdf
    • https://cdn.sqhk.co/redixebu/aJl0Ygh/mansfield_park_2007_parents_guide.pdf
    • https://cdn.sqhk.co/zuxosutuku/hjtoXLL/puxapadin.pdf
    • https://cdn.sqhk.co/zegareguw/VhiDRv7/arena_football_tryouts_2020_florida.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/01801a70-5de6-4c93-b112-e1f809a4f5f2/69171612793.pdf
    • https://uploads.strikinglycdn.com/files/1cf2ebbb-1686-4191-a09b-1a04aaac3768/what_is_a_keyword_research_tool.pdf
    • https://uploads.strikinglycdn.com/files/4ec52820-4c7b-4f16-b4e5-1edd39338b9b/how_much_do_coast_guards_make.pdf
    • http://kosezofejesuxef.atwebpages.com/kidopilunenewonerato.pdf
    • https://uploads.strikinglycdn.com/files/b069dad2-4a7b-42fd-ae8c-38dbbe2e5676/which_would_hit_the_ground_first_a_bowling_ball_or_a_feather.pdf
    • https://uploads.strikinglycdn.com/files/1c53c2ff-55aa-4f7b-beee-831347a2f805/zefizakumedu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000128c1.bin
b9b76d91d60d4f85d64fd48b188d8eeb62624874d9dc3bc6aec585678dbc6d3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128C1 5368 bytes
font_01_sfnt_off00013b16.bin
d56067c7370e102bb499142dfa5cede04668d3ae5ca88967ea809bc2812ee959		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B16 11412 bytes

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