Malicious PDF — malware analysis report

Static analysis result for SHA-256 432a38303e0e575a…

MALICIOUS

PDF

77.3 KB Created: 2021-04-09 04:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: da702d3620a2c69476e94af178bd7d92 SHA-1: 81c3e2bad63b52f37f0b8d335405d2add1c48ea9 SHA-256: 432a38303e0e575aaf685d49bc0cbb0a27d162b8c743ec8b6e1018d4b009880f
214 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, indicative of a link farm used for phishing or malware distribution. The presence of a 'Download Now' lure and a QR code redirect further supports a malicious intent to trick users into navigating to malicious sites. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/strik?utm_term=why+isn%2527t+my+at%2526t+voicemail+working PDF link annotation
    • https://cdn.sqhk.co/vixawutozama/5ibgigi/59776344523.pdfIn PDF document text
    • http://levantegroup.net/manilitedezukawv02xv.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/fgjfhdd/coin_flip_roll20.pdfIn PDF document text
    • https://cdn.sqhk.co/panazomuv/j7wridf/manual_on_accessible_tourism_for_all.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabumamuv/hg10gdw/53866626023.pdfIn PDF document text
    • https://cdn.sqhk.co/buzomesil/hjUIHjd/45115525328.pdfIn PDF document text
    • http://yatvoyya.fun/56827250233ldv2o.pdfIn PDF document text
    • http://affilateapp.online/breville_smart_oven_pizzaiologn3gr.pdfIn PDF document text
    • https://cdn.sqhk.co/dafisuwikib/Oibiahg/waloma.pdfIn PDF document text
    • https://cdn.sqhk.co/woteruzid/jrHidYS/jarelukor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_1cbdad081a2d4ea785129a31dea7c027.pdf?index=trueIn PDF document text
    • https://bee08bb6-d8c1-4cc5-89f0-d6ac88a4f64a.filesusr.com/ugd/8b8a1f_1b90a37e38b8455d94aacf8e51eda1d0.pdf?index=trueIn PDF document text
    • https://6dd05bf8-a32e-4ce7-8057-9a1894012cff.filesusr.com/ugd/4ce960_e281381761eb42ecb460d5712e71ee49.pdf?index=trueIn PDF document text
    • https://d64d5b41-a66a-4b78-b87f-0feaf8e9cf76.filesusr.com/ugd/cf1aed_cbcfd7e50f744baa8432f11645d49e1d.pdf?index=trueIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_0e6f336fa8724b499cf973ba2ddd8066.pdf?index=trueIn PDF document text
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_4a10284fb00c4068b7f554e60b15d25a.pdf?index=trueIn PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_f55db8e43d024ed5b743ecce8d62fb34.pdf?index=trueIn PDF document text
    • https://78a3f932-2eca-4366-91b9-d52a2f3c5f58.filesusr.com/ugd/a586f9_e9f28ee25a364827a675a2abf2857863.pdf?index=trueIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_c8940495561a4572a7746b72d46f92c7.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DC 4948 bytes
SHA-256: fccf43035cd0d7632a94b1f90eea11ec122dd417929c28ef7d9bc8ffbbe42ba2
font_01_sfnt_off000101a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A4 11596 bytes
SHA-256: c2894b5372483640e46a7aa9d560095b17f5256a36821eb51448f39aa08dd44f