Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d47b6a3bc62909…

MALICIOUS

PDF

67.5 KB Created: 2020-11-13 18:31:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b0f927c963480a0ed4656ba33bbe75e SHA-1: 7ade7cce5a62471c1ffe2eea4dc24596e0b4c1ee SHA-256: 09d47b6a3bc629094b1b126f246438d6af9bf24af0a2d8cae6184ae44e48dea8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to Weebly-hosted PDF files, indicative of a link farm or SEO spamming operation. ClamAV and ML classifiers identified the file as malicious, specifically a phishing or trojan variant. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://trafficel.ru/strik?utm_term=borderlands+pre+sequel+weapon+codes
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/1392291.pdf
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/03b622.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tosasugokod/the_world_on_turtles_back_audio.pdf
    • https://s3.amazonaws.com/jemazejodep/nh_license_plate_owner_lookup.pdf
    • https://s3.amazonaws.com/sifawekujiki/wogubuwezuraxotogusenodun.pdf
    • https://uploads.strikinglycdn.com/files/038d7496-411a-4481-a013-88b190a13969/xogulebe.pdf
    • https://s3.amazonaws.com/sasufufa/kinotusixakoxivagukelolo.pdf
    • https://uploads.strikinglycdn.com/files/0ffad41a-a140-40a6-9072-728a3fdba315/23348918593.pdf
    • https://uploads.strikinglycdn.com/files/6ea570cc-f992-4016-813a-e78398054642/90060136477.pdf
    • https://uploads.strikinglycdn.com/files/192697af-1676-4dd6-8673-0ad8b6aa6c88/nufegaletuvabitimetu.pdf
    • https://uploads.strikinglycdn.com/files/7b41df98-b7fd-4a15-a35c-34e231c7ad5c/chicco_umbrella_stroller_replacement_parts.pdf
    • https://s3.amazonaws.com/fadedosi/berix.pdf
    • https://s3.amazonaws.com/bakoloj/87756047508.pdf
    • https://s3.amazonaws.com/bepukuba/map_of_elturel_avernus.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_off0000ca47.bin
74d598e6efc5522ffd74dfcd41e2e0d4f006ba95dea9e573a2cf3e35ca71c7af
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA47 5332 bytes
font_01_sfnt_off0000dc8a.bin
8cda73d73cf5a32ee87e7b8b4cf09673007002830ba9649b1b5743bbe291b223
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8A 11052 bytes