Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7530266ee3d6372…

MALICIOUS

PDF

69.4 KB Created: 2021-04-11 04:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a95566cb821d28aed738e6f305347d86 SHA-1: b7dff9717bdd164e8ed8b7fa959031410a8ed371 SHA-256: a7530266ee3d6372d63ec155fda376125f00549163962813cd9132a39c050876
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://pilgrimland.com/sites/default/files/webform/resume-uploads/jokefogebefuzifuzew.pdf
    • https://www.blplegal.com/sites/default/files/webform/89971565628.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/59286961246.pdf
    • https://www.blplegal.com/sites/default/files/webform/pifijolaj.pdf
    • https://www.dgs-interparts.be/sites/default/files/55949953827.pdf
    • http://www.guninetwork.org/system/files/webform/heirri_proposals/80098342864.pdf
    • https://www.dgs-interparts.be/sites/default/files/68462010443.pdf
    • https://www.woonsocketri.org/system/temporary/webform/54194604641.pdf
    • https://www.jwico.com/sites/default/files/webform/kupoxogij.pdf
    • https://www.uts.cw/sites/default/files/webform/dupoxemijuwavamuvugorudiz.pdf
    • https://ambrose.edu/sites/default/files/webform/fenalop.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/22559513310.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=mla+telugu+full+movie+free+download
    • https://thesanfordschool.asu.edu/sites/default/files/webform/fapivo.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d588.bin
4ae242eb6f424ad857c88d5296eca6f40462fbdbdbb4c92622bc476c1c12327c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD588 5204 bytes
font_01_sfnt_off0000e74b.bin
2b92fc62f2100ead633f47619f71509d7200dd09d29a8282dd2f494101220c31
pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 10600 bytes