Malicious PDF — malware analysis report

Static analysis result for SHA-256 8643eb123e67ad79…

MALICIOUS

PDF

62.8 KB Created: 2020-12-01 21:36:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 30ffd5408cbe52b3dc4cf16a39a367ad SHA-1: 26cec9a9a6cc668f70c219181ed2720c79a07cc1 SHA-256: 8643eb123e67ad79811f152a329bdd2790e5646ffa973eab02cccdaa990136d8
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is part of a link farm and hosts external URIs, with one primary malicious URL identified. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing trojan. The document body, though heavily obfuscated, contains text suggesting a 'purchase offer' lure, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.
  • 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/123?utm_term=joanne+purchase+offer+presale PDF link annotation
    • https://dedeluruxizo.weebly.com/uploads/1/3/4/3/134305162/gusujiweram-molivuxonuwapi-dumidipasawem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_5fa05f9d0b3db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413112/normal_5fc2d26ea7b2c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/acd3f18a-ecc1-460c-b914-ba161d969997/12837872676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e6f6c57-58df-4757-af16-78e9ae3a427e/33222564006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74a3e65e-45b0-48b1-9c7c-31c188e4220a/magumawajigirixas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/990f14c6-d046-4dfe-b315-a99daeb43d77/vojixuputevatiweseroxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cbce9e7-09f6-46ea-8f60-6c3dfd01bea6/bulk_image_downloader_key_serial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d20eef5-359d-4ae1-8fcb-fd04bb527723/29654628262.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_off0000b89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB89B 5092 bytes
SHA-256: c519ddb85fe446395158a99fb45df01a77744b3224d657fc5c747da400784270
font_01_sfnt_off0000c9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9ED 10744 bytes
SHA-256: eb55dd383560da64244a5c8cbfc13cf6ccaabcb1df823677037c09e2f859b100