Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fcc6ed57925ac10…

MALICIOUS

PDF

76.5 KB Created: 2020-11-14 21:52:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3496e6204f2c8ff1ecdee87c63e3db9c SHA-1: 1494e7fe4de5fc049ecba7251048face50ceacfc SHA-256: 2fcc6ed57925ac106079f46bb301314e39f333127260e9c77e3c69816fb56911
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/strik?utm_term=cities+skylines+industry+traffic+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412780/normal_5fa9db0943ea2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415756/normal_5f9f6cd93fdd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419851/normal_5f9749e646481.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387421/normal_5f97faf40d724.pdfIn PDF document text
    • https://bapoxipen.weebly.com/uploads/1/3/4/6/134684349/jopanivijeki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426549/normal_5fa39fbdb893f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377704/normal_5fa19b6311bf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373004/normal_5f9f7fce11601.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/faa1bdb0-4ca2-4a74-921a-c15e9dd66462/nidixezukifilakozixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f1c8fd4-c5d6-4bcf-8dcd-58f1aab118a2/46207203323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dba59aa-8ee5-488d-901c-0f5e663040e7/rupebum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7065caf-67df-427e-bfdb-89e3ad89b5b3/34187736170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24f40064-6e2c-4b96-bb99-7f45cad229e9/place_values_in_decimal_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43ae5de1-259e-4a3b-a777-774fa94061d2/a_hunger_artist_by_franz_kafka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d61ca99-d5c0-439e-b4b2-85e6444f1070/424055080.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_off0000ee93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 5260 bytes
SHA-256: 7d5699392d0e754bf3303f16ad1ad265c8cc0dd458cb51bfd9da32040ee82cdd
font_01_sfnt_off00010092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10092 10652 bytes
SHA-256: 85a3ad39245e5b99686b94ef223ebd70651f62ba72025d537f2e85b7760893ed

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