Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97f405f05fffa4b…

MALICIOUS

PDF

82.4 KB Created: 2021-02-17 01:42:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fd8284cf73c93ec5ab168bbd6568bfe3 SHA-1: aafe82951c4e736d04e11c505295b31a951998f6 SHA-256: c97f405f05fffa4b0a316e47195a8c5f9ad7a7df3cd297f408816012cbe3f8d8
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The numerous embedded URLs pointing to disposable domains indicate a strong likelihood of phishing or malware distribution.

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 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://yafferge.ru/strik?utm_term=sony+rx10+iv+vs+rx100+vii In PDF document text
    • https://cdn-cms.f-static.net/uploads/4467036/normal_5fd2171090cc3.pdfIn PDF document text
    • http://olipaka.xyz/19679223746gcdy8.pdfIn PDF document text
    • http://secureappeal.com/lizilepimupegunonutiokxtk.pdfIn PDF document text
    • https://cdn.sqhk.co/rekosiseweno/aJoFkLj/free_download_m4a_to_mp3_converter_for_pc.pdfIn PDF document text
    • http://stopnutristrike.ru/twitter_search_people_s_tweetsugcg6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410186/normal_5fcc3bd7b897e.pdfIn PDF document text
    • http://seomagnat1.online/hp_envy_4500_printer_user_guidewq4sr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382406/normal_5fdc362c6f5cf.pdfIn PDF document text
    • http://sport-stavki.fun/pijabezibubifetebuk2p4dv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jogisav.epizy.com/gewoguguzowoxa.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/bloons_td_4_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/29494537689.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/94044228448.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_off00010530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10530 4964 bytes
SHA-256: 955fa48886c9bfd1fb57a2f78692911131e8723322611998e1822838d6acda44
font_01_sfnt_off0001163a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163A 11376 bytes
SHA-256: f8ee05ea0a5bce704d111d46710648f5478996af98d00947d9009d630d6a369e

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