Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f611de3a1a868fa…

MALICIOUS

PDF

86.0 KB Created: 2021-02-24 22:55:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 9b17d8297404fbcb6297383d18a33866 SHA-1: 6827a3d1aa3264cdfba8b670e88b346bb53d1002 SHA-256: 6f611de3a1a868fa8d2eee6399e3d3a7642de1eee9fde048af51230a8458f05e
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirectors or link farms, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=as+i+lay+dying+chapter+2+summary In PDF document text
    • https://cdn.sqhk.co/teposodigar/jfjfwEK/63529221691.pdfIn PDF document text
    • https://favonewe.weebly.com/uploads/1/3/2/6/132695639/rekar.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/kugupekuvajibidedis.pdfIn PDF document text
    • https://cdn.sqhk.co/pozedezupase/gihghgb/cross_road_blues_instruments.pdfIn PDF document text
    • https://magirakikepemun.weebly.com/uploads/1/3/4/0/134000039/9217596.pdfIn PDF document text
    • https://cdn.sqhk.co/padumaxifop/idf8HKF/car_loan_calculator_with_trade_in_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/2hfK6gf/ragdoll_games_battle_simulator.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wuwedilejom.myartsonline.com/mumazowekulox.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/dell_compellent_sc8000_deployment_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/4635306144.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/asbestos_roof_sheets_are_they_dangerous.pdfIn PDF document text
    • http://pozidijapepore.atwebpages.com/71862460962.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/51833657770.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/95620238395.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/optiplex_7010_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/geometry_worksheets_grade_10.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/4622526304.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/my_talking_tom_apk_mod_unlimited_coins.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10687 5484 bytes
SHA-256: 1bc08dd3a689357a893873f6b359ebdf0306b894e2fae204f534d4ac5a0b5255
font_01_sfnt_off000118fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FA 10312 bytes
SHA-256: 36f2adeb0ef6b680a6284d0604e979cb9ed04149131567b0b5450247729818dd
font_02_sfnt_off00013c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C58 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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