Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbdb4e33806f8b71…

MALICIOUS

PDF

69.6 KB Created: 2021-03-09 21:11:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3cdef1a1f5ea20fe787e1c558312e428 SHA-1: 2790f1a253c216c8b5a20842e8e6fd7ed325eeb1 SHA-256: fbdb4e33806f8b71bea0ea8f8433a198b990016e3b4b8d12b24899b18e95e883
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous external URIs were found embedded within the PDF, many pointing to disposable hosting and link farms, indicating a likely phishing or malware distribution attempt. The document body contains garbled text and metadata related to wkhtmltopdf, suggesting it may be a crafted lure rather than legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/123?utm_term=exclamation+mark+on+excel+spreadsheet+icon PDF link annotation
    • http://instasavephoto.com/aircare_humidifier_parts_listmo3i3.pdfIn PDF document text
    • https://retelajipubo.weebly.com/uploads/1/3/4/7/134700068/sewirurukigavikopeve.pdfIn PDF document text
    • http://gojawufeki.getenjoyment.net/dilosuzekexivifu.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/h9glhyB/addison_rae_dance_videos.pdfIn PDF document text
    • http://blekrossi.ru/nepali_typing_guidelineg3iwx.pdfIn PDF document text
    • http://famexukox.22web.org/nuance_power_advanced_3_download_testversion.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460457/normal_5fc597d7ef810.pdfIn PDF document text
    • http://thelandofbadideas.com/putefavufsd05q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365620/normal_5feb8a18c0b36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469645/normal_602ca5a285c69.pdfIn PDF document text
    • https://cdn.sqhk.co/pulazapusaw/mojf2wz/30950244135.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453908/normal_5ff5cf9670291.pdfIn PDF document text
    • https://waguxezemi.weebly.com/uploads/1/3/4/7/134703223/9557993.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/b7JMyRM/23630942971.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gajopule.myartsonline.com/46455115622.pdfIn PDF document text
    • http://toxukanubevaga.rf.gd/aukey_dash_cam_dual_manual.pdfIn PDF document text
    • http://zefefudu.rf.gd/7542849051.pdfIn PDF document text
    • http://gonegexunu.myartsonline.com/how_to_train_your_dragon_book_4.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_off0000d2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C1 5400 bytes
SHA-256: 1ac58b63627a1a35a6df6cff9c1d1d53192390076dc39d01de65342fc7e698cf
font_01_sfnt_off0000e4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FA 10644 bytes
SHA-256: 7a772bbb114837c758805f49a96559c33a720b8f4c43c0807d19d96d6b0f7d13

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