Malicious PDF — malware analysis report

Static analysis result for SHA-256 e46531de8d29f9fc…

MALICIOUS

PDF

78.8 KB Created: 2021-02-20 09:43:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4713fbe73fa7b2a4f2717e760d14f9a1 SHA-1: 77602e4da002dead0e0e5ad3351e2ac01fc0b8d4 SHA-256: e46531de8d29f9fc82c80f6a5938cc3d136563b4b903df151f7c9ace254bca9f
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the embedded links suggests an intent to redirect users to phishing or malware distribution sites, likely as part of a spearphishing campaign.

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=marvel+legendary+fear+itself+rules In PDF document text
    • http://jonoxosu.iblogger.org/vishnu_bhagwan_photo_hd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380887/normal_6027515863ce5.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/6aTJv7l/hello_body_customer_service.pdfIn PDF document text
    • https://cdn.sqhk.co/zeritogekuja/egc0Wij/36287224410.pdfIn PDF document text
    • http://ifeelgood.club/643644376734x0kg.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/ggBhd84/worst_game_ever_in_roblox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468554/normal_601e678e78c50.pdfIn PDF document text
    • https://cdn.sqhk.co/furigelo/jaWVhdB/pulse_3d_headset_ps5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469634/normal_6003bdb73f2ea.pdfIn PDF document text
    • http://sokolov.fun/gorilla_diet_in_zoo_saves_boyd836v.pdfIn PDF document text
    • http://arnautmebel.ru/67250767924y6wu7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370064/normal_5fdfb447d9f5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418783/normal_60151e4b1a83d.pdfIn PDF document text
    • http://xudisoda.66ghz.com/odia_ganesh_bhajan_dj_song.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/dotabuff_kunkka_guide.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_off0000fa05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA05 5240 bytes
SHA-256: aa51a3624dd22b15c1d87e69e2a700010f8e0f2540e66cd08d1822536cd2bcd9
font_01_sfnt_off00010c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C04 10080 bytes
SHA-256: 23e8e6cefcc184ed24e5ed52b0004f13f68d197df4f6cbaebf17be463a906643

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