Malicious PDF — malware analysis report

Static analysis result for SHA-256 06d611687f65f979…

MALICIOUS

PDF

69.8 KB Created: 2021-04-04 14:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e41ddb50ab1f659926f02b64a1a81d1e SHA-1: 8d0323d64f76e210f8c9610e8f5815170e248f27 SHA-256: 06d611687f65f9798f4d2f9d41fc75304af1f88e95c60f3e7d12e6b5aa54029b
164 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. This suggests the document's primary purpose is to redirect users to other sites, potentially for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/aws?utm_term=stockton+dunkin+donuts+hours
    • http://dijumefifa.22web.org/segoterefipakuwuraderurib.pdf
    • http://pexulisinipev.sportsontheweb.net/giduvuvovesisezirifab.pdf
    • http://pimesizawox.sportsontheweb.net/aterosclerosis_y_arteriosclerosis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fezivadijar.rf.gd/89147073655.pdf
    • https://uploads.strikinglycdn.com/files/c6d59cd3-ee8f-4a8c-b454-b85d03963e95/tisul.pdf
    • http://jisipisadelotab.epizy.com/nursery_rhymes_english.pdf
    • https://9b321a86-0615-40a7-b684-6dced782f4cc.filesusr.com/ugd/e3cae3_7729590b08e244699a277c936c997800.pdf?index=true
    • https://uploads.strikinglycdn.com/files/36e9cb55-9828-452b-ab6c-1741288cb2ef/hansel_and_gretel_2002_rotten_tomatoes.pdf
    • https://uploads.strikinglycdn.com/files/dbb6a2f2-4450-41df-8523-8c3d55255f56/85468666413.pdf
    • http://bunopudo.rf.gd/31195838058.pdf
    • https://uploads.strikinglycdn.com/files/1922b55c-986e-49dc-91c8-90d0476b336f/how_to_reset_samsung_washer_door_locked.pdf
    • https://uploads.strikinglycdn.com/files/e339a314-6418-460d-a6a7-d5366a72f6e9/46860832065.pdf
    • https://uploads.strikinglycdn.com/files/edb70bda-9231-4f10-96fa-5e188c704990/23692961912.pdf
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_833c58899a8844d4bd57ae69179cdabf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/77a5cbe1-a0e6-4e48-8593-81a81156e447/crack_nitro_pro_9.pdf
    • http://relurifiluxel.epizy.com/chronological_cv_template_doc.pdf
    • https://uploads.strikinglycdn.com/files/601d8ba7-4cd2-4066-b92c-f7eff60317f2/67955430682.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_off0000d58d.bin
d3040f7a8eeeaeeaca49acb5b20368a9740c0dc599ec0c703d09ee013e4e2cf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD58D 4952 bytes
font_01_sfnt_off0000e663.bin
bb5383cf94daee7aff6eb31d755901bc513faaea54c2b38f2c6e94a3ca9d90a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE663 10424 bytes

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