Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b781b2c0d2d813e…

MALICIOUS

PDF

73.7 KB Created: 2021-03-09 22:08:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 873544a05683546494d93ef7d997e0e9 SHA-1: 53661f6a6931d62333f5eaa4f9c9dd3d33a0e190 SHA-256: 9b781b2c0d2d813ee2df87d188ae2dd8eeee1145814d8d1dbd89ad59b24dfe14
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, with a significant number pointing to SEO-optimized PDF farms, suggesting an attempt to drive traffic to malicious sites. The embedded URLs and the PDF structure strongly suggest an intent to deceive users into visiting potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=catabolismo+de+hemoglobina+pdf
    • http://itasummer.fun/best_customer_service_interview_questions_and_answerskfxbz.pdf
    • http://delinapod.mypressonline.com/81988499749.pdf
    • https://dizakevusarebiz.weebly.com/uploads/1/3/4/5/134581037/789876.pdf
    • https://rigagebefizo.weebly.com/uploads/1/3/4/6/134631069/6640903.pdf
    • http://sukuwodexi.scienceontheweb.net/tegamefivajo.pdf
    • http://rovanenafet.getenjoyment.net/88802408732.pdf
    • https://cdn.sqhk.co/xexisini/bhgkiaY/sadad_meaning_in_hebrew_dan.pdf
    • https://fuvepuzineg.weebly.com/uploads/1/3/4/4/134463404/9537711.pdf
    • https://xuduwenonotowud.weebly.com/uploads/1/3/1/3/131379268/138cf076c73.pdf
    • http://gapagal.mywebcommunity.org/hamlet_book_age_rating.pdf
    • http://feelslike35.com/9985488416hp9fb.pdf
    • https://cdn.sqhk.co/dibirolinu/DkTXidS/y8_bmx_stunt_bike_games.pdf
    • http://erogan24.website/pop_instrumental_beatsdig10.pdf
    • https://waperimawomexav.weebly.com/uploads/1/3/4/7/134733778/eecbe61.pdf
    • http://lishop.site/85127524216vl811.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_eaacc6becec145b7834d9afef6f49c1f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d2a94198-06bc-4a58-8cfa-2c58407bb94f/sims_3_expansion_packs_ranked.pdf
    • https://uploads.strikinglycdn.com/files/0839d895-1994-4dfc-941c-c0821be8282b/85507926056.pdf
    • https://uploads.strikinglycdn.com/files/0623b7f7-f92f-4b06-9c88-8e5d5a843c99/minn_kota_powerdrive_v2_70_autopilot.pdf
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_5601f83f5d2d4584a387b4345e0c6e41.pdf?index=true
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_c1ee6fb36492468b92906f30999129ef.pdf?index=true
    • 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_off0000e0cd.bin
cd829af994bb76668e3ad2da55b3ba6fb77570a244bed10120dd188550db6c68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CD 5404 bytes
font_01_sfnt_off0000f2fe.bin
92eac9058c573b55c101d364e1d225948a43be6c715d8e3eaa7d6d086551f2e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 11960 bytes

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