Malicious PDF — malware analysis report

Static analysis result for SHA-256 96a7c06808237fd0…

MALICIOUS

PDF

115.4 KB Created: 2020-11-24 15:00:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b01795e7a1e71279c527fa0457e63a2 SHA-1: d2fa63af7d34c9bf6af7ddd12281f8cd37019d1a SHA-256: 96a7c06808237fd0b8e823459b81af58c71c156d39c91d89c49409906eba6571
172 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on various platforms. The presence of a link farm and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence. While no scripts were directly extracted, the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafffi.ru/123?utm_term=android+apk+cracked+apps
    • https://cdn-cms.f-static.net/uploads/4374853/normal_5f928a52245dd.pdf
    • https://lorujuxivole.weebly.com/uploads/1/3/4/5/134595667/jirumijixaker.pdf
    • https://cdn-cms.f-static.net/uploads/4499635/normal_5faeb48671fa0.pdf
    • https://zadavutuni.weebly.com/uploads/1/3/4/3/134343582/5336337.pdf
    • https://cdn-cms.f-static.net/uploads/4405430/normal_5fa2fd9748227.pdf
    • https://zurowesijeja.weebly.com/uploads/1/3/4/6/134630916/mufobolijupemiza.pdf
    • https://cdn-cms.f-static.net/uploads/4481527/normal_5fb4baddbf739.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sugosubexez/73837592333.pdf
    • https://uploads.strikinglycdn.com/files/27ba019d-5762-4962-b3d2-843896c7a248/dirty_boyz_discography.pdf
    • https://s3.amazonaws.com/vavapekadoliti/77245507276.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_off00018a2a.bin
3e176ff26dc8f945e046c156d37d07fe07cd5dae06cade83e9a31df6c2ef9bfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x18A2A 5088 bytes
font_01_sfnt_off00019b89.bin
8e629a8d4931ef4895bf02ad72466a9bb8eebec74508b40d555065b849c575e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x19B89 11192 bytes