Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a8a5b94e9ab87b…

MALICIOUS

PDF

79.9 KB Created: 2021-04-04 22:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c188694eb2fcb6549108959818ea23e SHA-1: 6118eccafa4b682c941aeca14c3bf7b766ed78a1 SHA-256: 33a8a5b94e9ab87bc8ab9dd028c1a7398be4fccbbcb930cc2643c671044f4dca
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a "PDF_SEO_LINK_FARM". One prominent URL, 'https://jacksth.ru/strik?utm_term=fios+voice+remote+setup', is presented in the document's metadata and body, suggesting a lure for users seeking setup instructions. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

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://jacksth.ru/strik?utm_term=fios+voice+remote+setup
    • http://lemumelubijene.iblogger.org/best_graphic_design_software_for_beginners_free_download.pdf
    • https://busajivajikiguv.weebly.com/uploads/1/3/1/3/131384407/gaxusazofetusiluvib.pdf
    • https://nupuwumot.weebly.com/uploads/1/3/5/3/135305030/mabanogawu-ximinoramad.pdf
    • https://xepefebew.weebly.com/uploads/1/3/4/4/134440437/fepize.pdf
    • https://wawupibinotab.weebly.com/uploads/1/3/4/9/134900246/zitoluxom.pdf
    • https://tiketutowiko.weebly.com/uploads/1/3/5/3/135345961/5399801.pdf
    • https://lapadodipelij.weebly.com/uploads/1/3/1/1/131164402/fezesotapofagibifa.pdf
    • https://delidago.weebly.com/uploads/1/3/0/9/130969485/c42c6bf830d5.pdf
    • https://robaralimojo.weebly.com/uploads/1/3/0/8/130814718/ea445d713fcb76.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kavalukato/how_to_setup_emerson_wireless_thermostat.pdf
    • https://uploads.strikinglycdn.com/files/8693bf40-cf53-4d76-b098-2da68da2f2d2/bostitch_f28ww_instruction_manual.pdf
    • https://s3.amazonaws.com/wajufifenoxuj/wakekenuvowedenileram.pdf
    • https://uploads.strikinglycdn.com/files/3adebd6b-4f61-4302-b22b-cfd6b775a78a/89288137021.pdf
    • https://uploads.strikinglycdn.com/files/c9933a75-0fb6-47c8-a67c-3ab8cecdf7fa/34801695690.pdf
    • https://s3.amazonaws.com/sorogamat/gasus.pdf
    • https://s3.amazonaws.com/fenatagazise/tositebuz.pdf
    • https://s3.amazonaws.com/babuxufarizuxur/labitux.pdf
    • https://s3.amazonaws.com/joterige/management_of_dyspepsia_guidelines.pdf
    • https://s3.amazonaws.com/xeruxaxer/coleman_evcon_presidential_heater.pdf
    • http://pamubaj.epizy.com/76981189341.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_off0000fcc4.bin
09d2449fa2ed412ecdd6660e7966969452e56e4a9ff3e9b3ac0fa2f890af8569		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC4 4852 bytes
font_01_sfnt_off00010d3d.bin
3716ee00026b53167181b9ed7b83a37f47039468a090ee0e591679470a184b37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3D 11076 bytes

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