Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc12bbfb55a387a2…

MALICIOUS

PDF

87.4 KB Created: 2021-09-17 04:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9ef0100f42bf3ddae57c2c77d9a9a8de SHA-1: a2409a59e5e801313e954fd20aabeeddbfae6214 SHA-256: cc12bbfb55a387a20119c870ac9d5f531a6bb122e671d1108f94e9f1e7ca363f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the final destination. The PDF structure and embedded URLs suggest an attempt to lure users to malicious websites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://synerhu.ru/uplcv?utm_term=jetpack+navigation+compose PDF link annotation
    • http://app0.linkeo.it/ckfinder/userfiles/files/jobenovotix.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/zajarun.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/potenewixajijiluf.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/kogajomivugexusibamimam.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1631841433990649467.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/80511940037.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109131358183917.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/365504_pafopukimid.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/suburiverodig.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/81365770777.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/fotisolaxuzi.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/gevurok.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/32159627895.pdfIn PDF document text
    • https://nyig.com/files/file/mijitibesozonuseto.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/jenuwovivebu.pdfIn PDF document text
    • https://medpressa.ru/files/file/marowafu.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/gasogisokakofizogugofa.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/93368916316.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/zomobererurefamilubevep.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/javojor.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/misudu.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/26128349904.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 18288 bytes
SHA-256: 5b13b2cf202cde97c46eb33fee2428c485823cd4cfe1d5a7b1a87624d705f1f9
font_01_sfnt_off00011f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F31 10720 bytes
SHA-256: 43c4d7a9ebc15513cf0098d3b5cfa618811b338cd4028ebab9d2a264aa3e3e04
font_02_sfnt_off000137eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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