Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd3a217b02b141a…

MALICIOUS

PDF

69.4 KB Created: 2021-01-04 09:26:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 118fd3e1ec5d404fd3e8e30c06a8d2d0 SHA-1: d481090f0f024ae74b139a03b5af46bf983d5243 SHA-256: 4bd3a217b02b141aadb95d7d68a9e820728539d93d1e83dd2fac71909ddc10b1
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, trafftec.ru, which is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://trafftec.ru/123?utm_term=aguda+llana+esdrujula+in+english
    • https://cdn.sqhk.co/jevipugirofi/qjageig/76614844299.pdf
    • https://cdn.sqhk.co/fuzokikili/giR44eL/high_mx_player_web_series_wiki.pdf
    • https://cdn.sqhk.co/pepitaji/cOS1Sjf/papatizarabuvuvorakala.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gifiz/noxemoxuxejiku.pdf
    • https://s3.amazonaws.com/rubidokezive/81339327024.pdf
    • https://s3.amazonaws.com/supefujoxopubu/gupifomovegazerekutige.pdf
    • https://s3.amazonaws.com/wupagivoz/dogevetejijalibelo.pdf
    • https://uploads.strikinglycdn.com/files/a0905251-f8ee-469c-b159-d073b34e757b/naming_binary_compounds_with_roman_numerals.pdf
    • https://s3.amazonaws.com/gixawetopoli/area_of_triangle_using_sine_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/591ad01a-a54f-4eff-b0f2-3cdd9444a205/19362645341.pdf
    • https://s3.amazonaws.com/muwomapotumugi/aimp_music_player_skin.pdf
    • https://uploads.strikinglycdn.com/files/a5744474-e6e7-4323-9199-640783ee3b61/94672274082.pdf
    • https://s3.amazonaws.com/lorifawuvawot/freeport_high_school_pa_phone_number.pdf
    • https://s3.amazonaws.com/ditiruz/xugenozubi.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_off0000d375.bin
82eef293eddd04bcec1c980c990b4fb51335539cf4c5e63134f2cbc39a696a04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD375 5152 bytes
font_01_sfnt_off0000e4f9.bin
e4c66d592b2ca8d6f1bc1d164e0141254fa5023903b509136f94bc8dfa7e823c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F9 10564 bytes

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