Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef067afba290fd7…

MALICIOUS

PDF

99.9 KB Created: 2021-04-28 15:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 93f7aea6e4afb6dd07ed061244435a05 SHA-1: c23573c54f5b5c87245e05c77ccd4bad0b7c8f0c SHA-256: eef067afba290fd791553c3f646f3ac3d5e8a9442823e9c0b5695a97d7418c35
196 Risk Score

Malware Insights

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

This PDF document employs a common SEO-based phishing lure, presenting itself as a maintenance schedule to entice users. It contains a large number of external links, many of which are redirectors, suggesting an attempt to distribute further malicious content or lead users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://resalured.ru/strik?utm_term=detroit+diesel+series+60+maintenance+schedule PDF link annotation
    • https://cdn.sqhk.co/rawerusiwala/Wgdigji/gojuribupopavubozogav.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/jsiiB1A/97814426336.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/JkjahfK/patabifoxe.pdfIn PDF document text
    • https://cdn.sqhk.co/nepodowu/GcgdieV/diana_her_true_story_book_read_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/muxuzoxipopa/hfkeic7/6025797402.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/jegs29V/my_talking_tom_2_game_download_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_6cb276db5787478a8e2f4a19a81c0086.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/85d38100-790e-4e80-9245-d441f31c8e12/zufejadet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f2304ed-7442-47e4-a7f9-4ebd537fe3c1/how_many_pages_does_who_moved_my_cheese_have.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65ad1f33-f30b-4eb3-8694-4c2b5cb30794/natosozevojaluzeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04400c72-8ac5-4179-8cfb-731c0172fd43/bafonedokos.pdfIn PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_16a03234645c461789a11a7ab0607a40.pdf?index=trueIn PDF document text
    • https://78de399b-5cb1-4d05-8290-e7933402b20f.filesusr.com/ugd/10f998_cd77e24799f24abcb810bbf2ae66094d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c3c29c0-72fe-4d5e-bef6-f74656a8397f/53384662576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/146256cd-0272-4e98-9bb9-522f4895cb88/tiwuzipinodoxobobetarag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14e01f0e-1974-4bd9-9547-6e0d1d0f3bf6/dometic_rv_fridge_not_cooling_enough.pdfIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_dcf1c702e698478f97bfcb83f008cecc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8133245-b2d7-4f1e-baf6-d04320748732/kejajowugula.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_off00014b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B86 5476 bytes
SHA-256: fc226e787c1fedeeceb3b4a1f47c76b51a623a387a8bced7c67cb4ffc7313c01
font_01_sfnt_off00015dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DFA 10620 bytes
SHA-256: c20539166b980bae5d3efbb86ad46b97d957b39a14b814f1481b7cf7f48a457b