Malicious PDF — malware analysis report

Static analysis result for SHA-256 06fb517cc89d7182…

MALICIOUS

PDF

71.9 KB Created: 2021-02-13 16:30:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a8c3af1096b035321f4bc98eaab7c11a SHA-1: 285463d9b034fe89ec3e4640288b4f0561b1bc12 SHA-256: 06fb517cc89d71826f9c68f0c0b87852cd6f6abf3df5bda49dd972f1d91f3144
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'chain rule questions and answers pdf', suggesting a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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.
  • 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://crophysi.ru/wix?keyword=chain+rule+questions+and+answers+pdf In PDF document text
    • http://ionatr.fun/details_of_gstodsxh.pdfIn PDF document text
    • https://cdn.sqhk.co/lotazoza/Mghbn3u/95721271070.pdfIn PDF document text
    • http://maska-respirator.shop/termination_letter_format_for_absconding_employeecsoz4.pdfIn PDF document text
    • http://bossyonlinex.com/city_car_driving_simulator_free_serial_number1pjmo.pdfIn PDF document text
    • http://grampus-shop.com/julijawaxeli0ux9.pdfIn PDF document text
    • https://getiwojaxewife.weebly.com/uploads/1/3/4/0/134012456/bobanasemejer_vasipivaxa_kibuta_xenewef.pdfIn PDF document text
    • http://prizinsta.site/1841951793e5286.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuzimobikuxuta.epizy.com/29036897666.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/android_activity_lifecycle_listener.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_off0000dd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5E 5252 bytes
SHA-256: ed662e07963f6170eb055bc595b7f7c55b379b362700a496cc93caf80fecee5c
font_01_sfnt_off0000ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 10380 bytes
SHA-256: d653a82d84746410357c054062669498ef32547212813d2cd50ce4a0a62751f6

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