Malicious PDF — malware analysis report

Static analysis result for SHA-256 9991b2a1f0f76828…

MALICIOUS

PDF

72.8 KB Created: 2020-12-24 21:51:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d4f7e149d9a4f6de0153c7b9c6f6acf SHA-1: dcfafe49750a072d04276484f2700722fe2d0a24 SHA-256: 9991b2a1f0f76828f6253926a70902e7306d070d159a195845c50941607e1846
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded content, though heavily obfuscated, appears to be a lure related to a workout plan, likely directing users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://traffine.ru/strik?utm_term=30+day+at+home+workout+no+equipment
    • https://ramojiri.weebly.com/uploads/1/3/4/4/134443871/3615990.pdf
    • https://cdn-cms.f-static.net/uploads/4381291/normal_5f8b3066594ac.pdf
    • https://tijabitosivu.weebly.com/uploads/1/3/4/3/134396728/3912065.pdf
    • https://cdn-cms.f-static.net/uploads/4470975/normal_5fd13b707b16a.pdf
    • https://zipadufemawosep.weebly.com/uploads/1/3/1/3/131398243/b88f448.pdf
    • https://cdn.sqhk.co/dibatafuba/gjfnJsy/1092428383.pdf
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/didigubodite.pdf
    • https://zelekunidos.weebly.com/uploads/1/3/2/6/132682808/lirofarebagigo.pdf
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/lapikavefiwat_tewuzadobesu_renog_wigoba.pdf
    • https://zirodamabesad.weebly.com/uploads/1/3/0/7/130740068/48f8e4f0ca5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b6bf17ee-223b-41a4-8553-4a085e620619/62946670877.pdf
    • https://uploads.strikinglycdn.com/files/1f6092d9-68e0-49ff-89a5-d9a0a92f9902/joboluregosejazexano.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_off0000e114.bin
0bb274c5ab3e4fe4cee74869fd0e1380964dbc15b656458b8d7e008a1b50a74e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE114 5584 bytes
font_01_sfnt_off0000f3fc.bin
2ee2ff800b1c596b1b1c218b480cfd8f187f24fc5f2433fde5147e636037344c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FC 10116 bytes

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