Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26d6817986d6529…

MALICIOUS

PDF

63.7 KB Created: 2021-02-21 01:15:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 724271a0c83e74cbe5bbb220b9e040d0 SHA-1: 6ac3da24415e1a40e34c63b0db1ec4ae4f6f3c16 SHA-256: a26d6817986d652923f1492be73812827d43a384caf83c7aa8d0c672de1161c3
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a strong intent to direct users to external, potentially harmful, content.

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
  • 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://maypoin.ru/wix?keyword=water+resources+water+loss+drop+by+drop+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421341/normal_600a214d1534f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407060/normal_5fe52ce583465.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445754/normal_600b70e35da85.pdfIn PDF document text
    • https://zegaxazidunuxe.weebly.com/uploads/1/3/4/7/134746987/ffba3fee5.pdfIn PDF document text
    • https://dilipifoson.weebly.com/uploads/1/3/1/0/131070096/3484441.pdfIn PDF document text
    • http://navalny.design/farufubaloadkit.pdfIn PDF document text
    • https://kifewaremavej.weebly.com/uploads/1/3/1/6/131606874/d2ea25a125687.pdfIn PDF document text
    • http://future-techno.ru/how_to_change_bulbs_in_a_sunquest_tanning_bedikx9p.pdfIn PDF document text
    • http://wopotirofi.22web.org/european_to_us_shoe_size_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388065/normal_5ff142094170a.pdfIn PDF document text
    • http://iglivesupportteam.com/dutonojugikejupawedtt.pdfIn PDF document text
    • http://makeyourself.xyz/how_to_change_oil_on_toro_6.5_mower4dft3.pdfIn PDF document text
    • https://cdn.sqhk.co/xesofosirija/gc18Rz3/tuxebikat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370062/normal_6004b6dc10ada.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gitogopafo.epizy.com/blender_2._8_64_bit.pdfIn PDF document text
    • http://vinegufoxa.rf.gd/85297020947.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_off0000bc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC72 5416 bytes
SHA-256: 0bf90eddd3315333ca97b903a1fc24d9c4a17f86705acc35dead55576c707a5f
font_01_sfnt_off0000cefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFE 10416 bytes
SHA-256: 377c5d4cbf48739e5a7d0c90f921566a87575d6260187b705f5c68ac2f30acb5

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