Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d7f3e9970b2070…

MALICIOUS

PDF

78.1 KB Created: 2021-05-18 10:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 464be4abbb52f2d19b98d85203d720e0 SHA-1: 75682e19171d47bd723ddd4c0992fe06e9623c73 SHA-256: a5d7f3e9970b2070acae1955eaf59100d18f10edd88533d548394ddcd8a4239c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or spam campaign. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains keywords related to 'dpf regeneration' and application metadata, likely intended to deceive users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=how+to+do+a+manual+dpf+regeneration
    • https://cdn-cms.f-static.net/uploads/4454056/normal_6017958bbcbd7.pdf
    • https://bamiwesuwo.weebly.com/uploads/1/3/5/3/135390748/50ac70.pdf
    • https://static.s123-cdn-static.com/uploads/4405922/normal_5fca13aba9d59.pdf
    • https://namonivet.weebly.com/uploads/1/3/4/4/134493383/ruzipuzifunop-rapiladusa-jevebufixiw.pdf
    • https://nikudedixipapun.weebly.com/uploads/1/3/4/6/134692686/xavazemokexukid_jakadonav_momujiranupova_jarojozelara.pdf
    • https://cdn-cms.f-static.net/uploads/4457577/normal_6029ad2651420.pdf
    • http://jopulemasawo.22web.org/all_bearing_size_list.pdf
    • https://cdn-cms.f-static.net/uploads/4378410/normal_6064dff0e6caa.pdf
    • https://cdn-cms.f-static.net/uploads/4415546/normal_60123e4770c07.pdf
    • https://cdn-cms.f-static.net/uploads/4389387/normal_6015c4744327b.pdf
    • https://simefaburiso.weebly.com/uploads/1/3/0/8/130814859/5bdf7ed41.pdf
    • https://static.s123-cdn-static.com/uploads/4388820/normal_6001071826ef7.pdf
    • https://static.s123-cdn-static.com/uploads/4450003/normal_5ff3a5be701ea.pdf
    • https://static.s123-cdn-static.com/uploads/4378619/normal_5fc9ae367b64b.pdf
    • https://cdn-cms.f-static.net/uploads/4484633/normal_6046542b8580c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vasedazixi.rf.gd/jlab_studio_anc_wireless_headphones_review.pdf
    • https://uploads.strikinglycdn.com/files/7d5b063e-f2fb-4266-aebd-e41de2e5882f/putid.pdf
    • https://uploads.strikinglycdn.com/files/24d8a3fc-2a25-4208-bd40-5c61397a303d/interview_questions_to_ask_account_managers.pdf
    • https://uploads.strikinglycdn.com/files/ade0f0d5-7122-41fc-b45a-57391c6203f3/what_to_watch_on_netflix_india_movies.pdf
    • https://uploads.strikinglycdn.com/files/21d81be8-3e5b-4909-bb8b-7040e40cddfa/bronx_masquerade_character_sheet.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_off0000f30b.bin
c41cf435ebdae14ca4e5d30fb6fbe9129617e9be2fce861c2e3caf69ec45eafd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF30B 5236 bytes
font_01_sfnt_off000104d7.bin
3e0fbe6c2423291e5a3ee90dd73a97ee97787e7b320dc5f00be33a70cf7022fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104D7 11348 bytes

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