Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a698de97dbbf42f…

MALICIOUS

PDF

102.4 KB Created: 2021-01-23 09:25:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ec59cd1f4175105747f4ffa3b90cf118 SHA-1: 97e86eb5903f6d8da96abd329e7186287650799a SHA-256: 7a698de97dbbf42f78ba7226f167cc81d0967974bb80a0f62e2a2584ecc1bdb7
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm containing numerous external URLs, with specific rules flagging it as a potential SEO manipulation or disposable hosting scheme. The presence of multiple Weebly-hosted PDF links suggests a coordinated effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://trafffi.ru/123?utm_term=pretty+guardian+sailor+moon+eternal PDF link annotation
    • https://gipewiraxo.weebly.com/uploads/1/3/5/3/135334151/cae87e4db934.pdfIn PDF document text
    • https://daxusumupazi.weebly.com/uploads/1/3/4/7/134702932/a282f42141479.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/hOgcRGM/block_fortress_war_apk_download.pdfIn PDF document text
    • https://wimofitadaxota.weebly.com/uploads/1/3/4/3/134362004/e64e4e47ed.pdfIn PDF document text
    • https://site-1168115.mozfiles.com/files/1168115/2016_curriculum_guide_in_epp.pdfIn PDF document text
    • https://femezusuf.weebly.com/uploads/1/3/1/6/131606597/7414311.pdfIn PDF document text
    • https://tagaxaxe.weebly.com/uploads/1/3/5/3/135390661/gexabemopizevoze.pdfIn PDF document text
    • https://wewofubajibopa.weebly.com/uploads/1/3/1/3/131381003/bisobedaje.pdfIn PDF document text
    • https://mowazaxof.weebly.com/uploads/1/3/4/7/134704653/vibasiwezip-nukazubigaki.pdfIn PDF document text
    • https://site-1177756.mozfiles.com/files/1177756/clash_of_clans_update_october_2020_date.pdfIn PDF document text
    • https://cdn.sqhk.co/xopimuje/Aif2yjh/gidevixexotevajabamini.pdfIn PDF document text
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/f6cb7ccdf47d.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/Hjfgghi/sdg_game_mdf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/corona_renderer_for_sketchup_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/boatus_hurricane_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/pre_algebra_pearson_textbook_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E0 19304 bytes
SHA-256: 7b07123f324ca45d032e4cfd7a0255c83eea5f55fc56cb9a0fa6af5b2b31876d
font_01_sfnt_off000154bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154BC 5248 bytes
SHA-256: 0a1cd19d437ee4cfd1e0cda8833482dcb427cc3fe0d31c808bac863c2a79a0b5
font_02_sfnt_off00016687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16687 11312 bytes
SHA-256: 6eb315358e7d50d89e94beaed5f9804aa01e907b05ec7fc669139198a904e095

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