Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9b53107d11b606…

MALICIOUS

PDF

76.0 KB Created: 2021-03-05 10:56:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c94ed711d77c2d7e5043df0d90973c81 SHA-1: 1e9313b99728bfe9e1350ef8fda75dd6c64f39bc SHA-256: ab9b53107d11b606f4df20afa33374365b5cc9a28ac782298e40af3ede0ec4a2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which are SEO-optimized and point to potentially malicious content, with one notable link to 'zajinet.ru'. The document body, though heavily obfuscated, suggests a lure related to 'Office 365 staged migration vs cutover', indicating a likely phishing or credential harvesting attempt. The presence of numerous external links suggests an attempt to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/award?keyword=office+365+staged+migration+vs+cutover
    • http://gulavimip.iblogger.org/87270944982.pdf
    • https://jubekufolofifi.weebly.com/uploads/1/3/4/5/134593927/0723ad7755658.pdf
    • https://rezisepadas.weebly.com/uploads/1/3/4/2/134235668/ab6023e1a.pdf
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/428238.pdf
    • http://suxiselukex.66ghz.com/girikekerexataluperuxewo.pdf
    • http://waduresiwiboba.iblogger.org/75489914434.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dejazuvorira/xerox_workcentre_7845_fuser_error.pdf
    • https://uploads.strikinglycdn.com/files/abd9cdd4-9667-4410-997f-547683be7ca8/black_and_decker_leaf_hog_bv4000_replacement_parts.pdf
    • https://s3.amazonaws.com/wajibile/jakuduxokaninegidoliwizij.pdf
    • https://s3.amazonaws.com/xonobijikivo/site_audit_pro_android_apk.pdf
    • https://s3.amazonaws.com/nisoxow/simedunegobegir.pdf
    • https://uploads.strikinglycdn.com/files/5c5883e3-6bb4-4a4b-9648-18651ef5ef96/rapedarakewexuwolokog.pdf
    • https://s3.amazonaws.com/jinotugiwomo/unblocked_games_the_impossible_quiz_answers.pdf
    • https://uploads.strikinglycdn.com/files/a408e26f-c8fa-4754-9e11-e1bc983d2c4c/37731276044.pdf
    • https://s3.amazonaws.com/lupuvogotog/fejugutitugubo.pdf
    • http://puzasapexuwuju.epizy.com/foreign_exchange_risk_management_techniques.pdf
    • https://s3.amazonaws.com/zolerazowubow/waromudu.pdf
    • http://xesesopid.rf.gd/23543724043.pdf
    • http://fitizoluwa.epizy.com/xokiluwumujijefakalisidi.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_off0000ea9e.bin
103bfe87411842e0d89c546ab6a4dd9abc1b46003b9036ddd4d8c96cb73188b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9E 5840 bytes
font_01_sfnt_off0000fe6d.bin
2a5d9eccfabd66b029d1476586c7bd9f625d31c61ba2e1a8f84bc8ca48aabe3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6D 10184 bytes

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