Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e154a395161dd62…

MALICIOUS

PDF

87.7 KB Created: 2021-03-04 08:31:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 455930c4b8b36f8e6f3165d02a134e9f SHA-1: af064d31febcc1e19b71f27a65f8b2404012945e SHA-256: 3e154a395161dd6279efefe830f779e115070c279ea5998e3fdbccab321b669b
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to 'percent composition by mass worksheet pdf'.

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://vilenefex.ru/wix?keyword=percent+composition+by+mass+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/davusegeb/KLdgjtI/11291396457.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/OeiehjO/birofozatawixaduzaz.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/hgdjdZu/sotozezonapawezaso.pdfIn PDF document text
    • https://cdn.sqhk.co/tofigidukug/kQgigdP/download_idle_fish_aquarium_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vemudumuxixu/hjhis6x/snowboard_party_2_world_tour_mod_apk.pdfIn PDF document text
    • http://mamafiposorugul.sportsontheweb.net/bushmaster_xm15-e2s_lower.pdfIn PDF document text
    • https://cdn.sqhk.co/juduxijumijo/dvsthgh/95836620503.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/97389920440.pdfIn PDF document text
    • http://jefopojat.iblogger.org/deadlift_upper_back_form.pdfIn PDF document text
    • https://cdn.sqhk.co/rorezina/CseXjjF/what_is_would_like_in_spanish.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://davofunup.onlinewebshop.net/asp.net_mvc_5_book_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/sig_sauer_p226_mk25_desert_9mm.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/54123226306.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_off00011979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11979 5760 bytes
SHA-256: 40b89aab2fcb59d5149d7a5429c5732e201297518527cfe1ec8c52c94e4fb459
font_01_sfnt_off00012d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D01 10760 bytes
SHA-256: cd8c2b1dd561ffbfa5f2dd9abf2817ac77b9a1a3fd57251c53616064c28b78ef

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