Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e22b223006c4f1b…

MALICIOUS

PDF

70.9 KB Created: 2021-01-11 16:15:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3f978f5cc01076fbfc2645f970df4100 SHA-1: 9fe4ccd945e6c39a8450263ffe2041ed9a50e595 SHA-256: 4e22b223006c4f1b4289d3faec267f117dbeb0dbf47350b576937841072d4c97
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/aws?utm_term=bmw+420i+m+sport+gran+coupe+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5f8afa88348e1.pdfIn PDF document text
    • https://site-1168131.mozfiles.com/files/1168131/39127992607.pdfIn PDF document text
    • https://site-1203683.mozfiles.com/files/1203683/kazovologowegovawel.pdfIn PDF document text
    • https://cdn.sqhk.co/todusukiraxi/UhiZeZQ/virus_alert_on_iphone_11.pdfIn PDF document text
    • https://site-1173381.mozfiles.com/files/1173381/9221896081.pdfIn PDF document text
    • https://site-1172089.mozfiles.com/files/1172089/blazetv_promotion_code.pdfIn PDF document text
    • https://site-1177462.mozfiles.com/files/1177462/toe_nail_art_designs_for_summer.pdfIn PDF document text
    • https://site-1168448.mozfiles.com/files/1168448/7_minute_workout_app_free_download_for_pc.pdfIn PDF document text
    • https://site-1174611.mozfiles.com/files/1174611/kugufixewetotikamegexan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454179/normal_5fc3d69697d03.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
    • https://s3.amazonaws.com/xisefowu/free_account_generator_discord_bot.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/augmenter_sa_concentration.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_off0000c95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95D 5636 bytes
SHA-256: d052871b921eedd847d1ac696cdfe81986648741058f478ef0029f190cb63894
font_01_sfnt_off0000dc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC81 10796 bytes
SHA-256: 28d575f57a06a2f87cd66271732547a35316d932f3c74ffd07948de3997d0c15
font_02_sfnt_off000100bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BF 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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