Malicious PDF — malware analysis report

Static analysis result for SHA-256 85790b1eeed5124b…

MALICIOUS

PDF

70.7 KB Created: 2020-12-28 00:32:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 881f766302e6f270435ae1f785686c36 SHA-1: d36cda36b517cd2cfcff6d76978f02187174fbfc SHA-256: 85790b1eeed5124b0c1b7e2d8e9d807ad824fa9618fd0cc3915b90fb9262a6c2
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or trojan distribution attempt. The document contains a mass of external links, including a suspicious URL that appears to be part of a link farm designed to attract traffic. While no scripts were explicitly extracted, the presence of numerous external links and the ML/ClamAV detections strongly suggest an intent to redirect users to malicious content or download further payloads.

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://traffking.ru/strik?utm_term=how+to+make+origami+dragon+that+flies+easy
    • https://dedeluruxizo.weebly.com/uploads/1/3/4/3/134305162/f5cf316133cb.pdf
    • https://gilaxaled.weebly.com/uploads/1/3/1/4/131438091/saredos.pdf
    • https://ganunuzarije.weebly.com/uploads/1/3/4/5/134518475/4252692.pdf
    • https://cdn-cms.f-static.net/uploads/4495264/normal_5fad998516a51.pdf
    • https://pazomanu.weebly.com/uploads/1/3/1/0/131069777/wegomanepatebujeso.pdf
    • https://senobatupubem.weebly.com/uploads/1/3/1/4/131437889/202a75.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/kimoweworape/free_tv_show_and_movie_app.pdf
    • https://s3.amazonaws.com/sizabo/46237532512.pdf
    • https://uploads.strikinglycdn.com/files/cfba4370-5418-4fff-a8f0-b02b23b348c0/mega_blastoise_ex_price.pdf
    • https://s3.amazonaws.com/purixifusipelid/bengali_calendar_1426.pdf
    • https://s3.amazonaws.com/donukadizolin/nes_emulator_apkhere.pdf
    • https://s3.amazonaws.com/tobojelusiwi/fs55r_stihl_manual.pdf
    • https://s3.amazonaws.com/sivanira/biwaxige.pdf
    • https://s3.amazonaws.com/petikamov/36536933529.pdf
    • https://s3.amazonaws.com/dazifozixawus/index_card_template_word_2007.pdf
    • https://s3.amazonaws.com/rorives/whack_my_ex.com.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbdb.bin
c9aef8504a50dbb8bc9d295c1705ba54f270fc58d1e4494093b3f00b852b6854		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDB 5328 bytes
font_01_sfnt_off0000dddc.bin
8f16283709d14550baf51610b1940617b9d9e6eb94a674daa071fcda4492bdfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDC 9924 bytes
font_02_sfnt_off0000ffbb.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBB 4324 bytes

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