Malicious PDF — malware analysis report

Static analysis result for SHA-256 349bf25a266562d0…

MALICIOUS

PDF

69.6 KB Created: 2020-11-22 16:26:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 36abb858eb203773fd9267fa2dd0652f SHA-1: cb28ea14d24b518d7be2342de3cae95c39f5a48f SHA-256: 349bf25a266562d033f5cc21f7e9cc29094dc0a1ca59b402ab01b50d5231d559
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous external PDF links, including one pointing to a known malicious redirector at 'traffmen.ru'. The document body, though heavily obfuscated, suggests a lure related to a 'webquest answer key', likely intended to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=to+kill+a+mockingbird+webquest+9th+grade+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4421350/normal_5f9fbc58c7a1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5f871c1726e15.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/belemewujusevi-zevojo-tokuni.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/ddede5d3-5b17-4cd6-83b6-1c0720ae4277/duck_life_4_unblocked_games_6969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c1375ed-4538-424b-8b82-0f282fdf1053/32025376408.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/bibme_mla_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8371791a-93e5-4481-a03d-7f7c8fffbf49/teacher_daybook_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/069601ad-d35b-47bd-ac41-2d9da467eb0d/zujugafefarukepi.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/apa_citation_format_website_without_author.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26d31d9d-1264-42ab-8dbf-3722c00d2290/capture_by_sonic_assault_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7b641de-8ee9-4339-8534-44456138ed2a/83789685563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce037921-51a0-457e-a713-0d6eb98a2743/crossfit_running_training_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32e2ffbb-ea7d-4fb5-aef2-567a9902a1e9/50113459001.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_off0000d089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD089 5880 bytes
SHA-256: 4e52d9d4198b9fcc8c81a59320c2ace0f8579232991c5312b4bcde9f62f6ac46
font_01_sfnt_off0000e460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE460 10812 bytes
SHA-256: fc82952e526e157ec8a929a5684e2c80635125b9622001eb7fb6ed1a381b5191

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