Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee7366ee73fbea4d…

MALICIOUS

PDF

75.6 KB Created: 2020-12-27 03:23:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5633d95bb5e443391b2cead30887083f SHA-1: d312212b4712691bd35961a77e170d866767685f SHA-256: ee7366ee73fbea4d18dea16acddfbba22d9543a453b498f940316334c879a1c9
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 significant number of external links, many pointing to disposable hosting, suggesting it functions as a link farm. One URL, 'https://traffine.ru/strik?utm_term=oreo+8+icon+pack+apk', appears to be a redirector or part of the malicious infrastructure. The document's structure and link farm behavior are consistent with phishing or SEO manipulation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=oreo+8+icon+pack+apk
    • https://dorikorojuj.weebly.com/uploads/1/3/3/9/133987202/wexuliwonale-jizipekilu.pdf
    • https://pimesawugure.weebly.com/uploads/1/3/0/7/130776266/xifitutof-fikipexur-felas.pdf
    • https://zaximasuxudaris.weebly.com/uploads/1/3/4/5/134590642/80265.pdf
    • https://cdn-cms.f-static.net/uploads/4403422/normal_5fd9be2cd2d5c.pdf
    • https://boxatikavizag.weebly.com/uploads/1/3/4/6/134680825/nejon_nimadugenep_fanonolosarid_nuxinoridez.pdf
    • https://giligigava.weebly.com/uploads/1/3/4/4/134494785/ladexenufuguf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vufuzewasi/tugosuwigatutumatoj.pdf
    • https://uploads.strikinglycdn.com/files/a3e6f218-8714-40df-8706-58effa179580/42916608923.pdf
    • https://s3.amazonaws.com/setaxilitozuko/24376328106.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1f8.bin
6c2e5290df5b26d60b16c477a75561a6a86d2346853fbbea69f55b77b1236e7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F8 5004 bytes
font_01_sfnt_off0000e313.bin
554e05f3ce76cb3ef7fce5c7076b2f58e4e1f2bfdd91bc6b73f7018ccb06d86c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE313 11992 bytes
font_02_sfnt_off00010bb8.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB8 16092 bytes

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