Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26a0a86c0412146…

MALICIOUS

PDF

66.0 KB Created: 2021-01-12 12:50:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 299587a61a3ffde79d90ab588e5ef2af SHA-1: 35508fe2f7480a02c24bc19d3a565bac830bfce6 SHA-256: f26a0a86c041214686f5d1534ecc81fe30507b682ad9588f058230117c2ff5fe
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://trafffe.ru/aws?utm_term=autocad+viewer+2014+64+bit+free PDF link annotation
    • https://cdn.sqhk.co/wazafanez/1oo0KEs/arzareth_yeezy_glow_in_the_dark.pdfIn PDF document text
    • https://site-1176708.mozfiles.com/files/1176708/30289165557.pdfIn PDF document text
    • https://site-1180563.mozfiles.com/files/1180563/american_dietetic_association_obesity_guidelines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369524/normal_5f883cc27fb29.pdfIn PDF document text
    • https://fufijejelido.weebly.com/uploads/1/3/4/3/134351462/3df9fcf9d0057ca.pdfIn PDF document text
    • https://site-1166597.mozfiles.com/files/1166597/octopus_watch_charger.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/dAub9hb/wink_news_stories_today.pdfIn PDF document text
    • https://site-1175049.mozfiles.com/files/1175049/98884163166.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/39652429500.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/biometric_security_system_project.pdfIn 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_off0000c384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC384 5652 bytes
SHA-256: 6b36461241584491b239037e26cd1dd5bc3a11536c0cf5d8aa0e7f0ede2472c4
font_01_sfnt_off0000d6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F3 10784 bytes
SHA-256: 2266fc906fea9b4c2dbe922290de7a3e667f5d4492d961d5377c31c67d3ba7b3