Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9174c4dcc75f3ff…

MALICIOUS

PDF

76.8 KB Created: 2021-04-04 22:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 034a66689f0c9126b5a4e3741b80faeb SHA-1: 5d74607b3e0b9d2dd59550815f6c83678f062e19 SHA-256: b9174c4dcc75f3ff4cf2d463a478c2f5aa4f0a0bc88ad4a11ca5e07f76e2d570
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a malicious phishing document, including a large number of external links, some of which are SEO-focused. The embedded URL points to a suspicious domain, likely intended to redirect the user to a malicious site for further exploitation. The document body, though heavily obfuscated, mentions 'Fios voice remote setup', suggesting a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9775

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://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