Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad9f0c6080cef91…

MALICIOUS

PDF

69.6 KB Created: 2021-02-18 09:01:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: deffe347b93c991d23b6a20e124f2dfa SHA-1: e9527e0e2591dfe2b17ed5d210d7c6775532dc48 SHA-256: cad9f0c6080cef9111a858be9945204a7764bf998a862158f84bdbe2d26b9521
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to technical documentation, likely intended to trick users into clicking the malicious 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://druttle.ru/wb?keyword=6.0%20powerstroke%20hpop%20rebuild%20kit PDF link annotation
    • https://cdn.sqhk.co/zesonixiv/jdjhNsw/13306410768.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410217/normal_5fe56f056de57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420612/normal_5ff3c3dde2468.pdfIn PDF document text
    • http://casbah2point0.com/jokejirafovapeliweso3r4r6.pdfIn PDF document text
    • http://tophomework.space/disgaea_2_reincarnation_guide23rew.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/id7Xrgg/batman_the_enemy_within_switch_walkthrough.pdfIn PDF document text
    • http://probmaka.tech/windows_7_ultimate_product_key_activator_32_bit_free_downloadz5kji.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/jhcgfbc/72513396918.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496391/normal_6004ebf92f549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499995/normal_600f04821009d.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/heigRx4/e_news_daily_pop_schedule.pdfIn PDF document text
    • https://cdn.sqhk.co/pesasotiro/njfgfr7/fifa_world_cup_2022_tickets_price.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370074/normal_602202b673767.pdfIn PDF document text
    • http://biwejobezimije.22web.org/company_balance_sheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://koxogulu.rf.gd/burul.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_off0000d0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AC 5364 bytes
SHA-256: c16369131393c12dca6cd51a5eb9ce9fb951eb773cb3827879a4cb8348417ab9
font_01_sfnt_off0000e2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F4 11316 bytes
SHA-256: 8a4c5b15343c54c5434ed4edc8cf4c0607891d6738b4d3af788da1b37397c81d

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