Malicious PDF — malware analysis report

Static analysis result for SHA-256 79438f35b5189680…

MALICIOUS

PDF

85.1 KB Created: 2021-05-30 13:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: de06ee1bdc46a4737f157b7d7f238371 SHA-1: c5d0582a98fca31d50e555e1cb1ede4e55b2988d SHA-256: 79438f35b5189680edcd72dc0736ae264df9978582377b5daef4cdb1378baad2
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 https://mezovuduw.ru/123?utm_term=remove+frp+samsung+s7+edge+android+7 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384483/normal_6048220993cae.pdfIn PDF document text
    • https://padotugaladod.weebly.com/uploads/1/3/4/6/134615244/8426656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375075/normal_6060d1f96a608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372983/normal_602525a37fdc7.pdfIn PDF document text
    • https://mofagobebaz.weebly.com/uploads/1/3/4/6/134633285/61d5ac6c17c9.pdfIn PDF document text
    • https://zetosodorab.weebly.com/uploads/1/3/2/7/132712291/nezekovat_bugoko_biwalufewib_jupanazap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403407/normal_604f733c1cb67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446646/normal_60504c61aa182.pdfIn PDF document text
    • https://pimanubidaw.weebly.com/uploads/1/3/4/3/134353005/98a5287dd0.pdfIn PDF document text
    • https://dopupuwupexiro.weebly.com/uploads/1/3/0/8/130813117/simezuwiguv.pdfIn PDF document text
    • https://lexaraziled.weebly.com/uploads/1/3/7/5/137500455/mefam-kasotopo-lisaj-tuzomowelijulag.pdfIn PDF document text
    • https://zisawotagaxikad.weebly.com/uploads/1/3/4/4/134478332/lakudupuke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374178/normal_5fd1012974af8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469370/normal_5ffa332c34e7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485573/normal_5fef4999c8cbe.pdfIn PDF document text
    • https://noremovex.weebly.com/uploads/1/3/4/8/134883944/nuzajotitevakifod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475565/normal_602fff02d8318.pdfIn PDF document text
    • https://fokatofevi.weebly.com/uploads/1/3/2/7/132712268/jikomajiba-jimisovidiruji-melalanorat.pdfIn PDF document text
    • https://nesexije.weebly.com/uploads/1/3/1/6/131607346/fefuritisifipawozuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505820/normal_5ff0d4dd686d5.pdfIn PDF document text
    • https://zenimuxen.weebly.com/uploads/1/3/4/3/134317926/4776895.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C3 5280 bytes
SHA-256: 3ba679010983ffc70eb7463115be7247441cd0405e669583c0c087325f1f79d5
font_01_sfnt_off000113ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AC 10948 bytes
SHA-256: 4f511b095a4f1458191cbce015c7abcc31fedd16e1be6c2c3067f2fabd178a14
font_02_sfnt_off0001390f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3