Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa6ce98ed9ba07e…

MALICIOUS

PDF

82.8 KB Created: 2021-03-29 22:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcc9c4b9979f0c3067b39741964e92c3 SHA-1: b7f27fb499cc95bc215fb0ee66c0ac236c9682fe SHA-256: 4aa6ce98ed9ba07e6fa5d72af5c0ff4e959c8e8b1916bf96a88756b0803f1d79
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal a PDF containing a large number of external links, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear textual lure. The presence of numerous external URLs, many with numeric slugs, points towards an attempt to distribute malware or conduct phishing by redirecting users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/aws?utm_term=asus+xonar+dx+user+manual
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdf
    • https://cdn-cms.f-static.net/uploads/4369498/normal_602b527779ea4.pdf
    • https://cdn-cms.f-static.net/uploads/4381962/normal_6046ae4d89511.pdf
    • https://cdn.sqhk.co/sebutarukaw/Bggifij/age_to_play_clash_of_clans.pdf
    • http://lenudes.com/zunobepq412f.pdf
    • https://jirafaribov.weebly.com/uploads/1/3/4/5/134599686/vuxuzibegamax.pdf
    • https://cdn.sqhk.co/zubavagi/dhjIhgc/cnc_simulator_pro_serial_key.pdf
    • https://cdn.sqhk.co/mixekuwuvo/iggfT6Q/68471423805.pdf
    • https://dujikofuzi.weebly.com/uploads/1/3/4/6/134610135/2971116.pdf
    • http://generatorsale.ru/17354236526yweqo.pdf
    • http://zajilakofudo.scienceontheweb.net/badamujegojulatukodud.pdf
    • https://sizikipumaxa.weebly.com/uploads/1/3/0/7/130739349/1860860.pdf
    • http://gasolotiravizid.sportsontheweb.net/iso_9001_quality_management_system_logo.pdf
    • https://cdn.sqhk.co/gabixeme/jbhfVIw/hero_pups_patrol_coloring_game.pdf
    • https://cdn.sqhk.co/rotonoba/WiaP4je/jonagotogawafodebinexexi.pdf
    • https://cdn.sqhk.co/sobetevod/nUibfha/graphic_designer_salary_california.pdf
    • https://cdn.sqhk.co/sadudolamom/icGiifH/57508091481.pdf
    • https://cdn.sqhk.co/kekelivig/hejgjaH/susutivemajuluwapus.pdf
    • https://cdn-cms.f-static.net/uploads/4366982/normal_6027df1fda6a6.pdf
    • https://cdn.sqhk.co/wikelere/1Kihhix/friends_english_song_download_pagalworld.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://godosuluto.myartsonline.com/89865084709.pdf
    • http://desejole.myartsonline.com/67690659517.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_off000106de.bin
b6754a9138120983acbe5d120647ca9561792dd09cd4eb08804551d2adb6924a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106DE 5028 bytes
font_01_sfnt_off000117df.bin
bcfd0c2e356e657d0681c33181f5699df9168c49ac67415715d73130b6981645		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117DF 11248 bytes

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