Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a04c5026edc893…

MALICIOUS

PDF

80.6 KB Created: 2021-03-14 01:57:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 80755a5912907b729cf7f42a06b95c10 SHA-1: 28dd99a1d9df577bd418941eabb679c298999768 SHA-256: d1a04c5026edc89371888778cf38e1869d15fa1376e3d5d92d834af43ae4242d
184 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to suspicious domains, flagged by heuristics as a malicious redirector link farm. ClamAV also detected it as Pdf.Phishing.Trojan. The presence of these links suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself is weaponized.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/strik?utm_term=robert+graysmith+zodiac+pdf In PDF document text
    • http://hurricane1.space/bovufunidanemuzipabitekass66af.pdfIn PDF document text
    • http://rizusapi.22web.org/lemabogituxi.pdfIn PDF document text
    • http://giocodigital.fun/33932765825yi4uk.pdfIn PDF document text
    • https://dexanefuv.weebly.com/uploads/1/3/1/3/131383512/zimamifebonenup.pdfIn PDF document text
    • http://erethiztzj.space/chinese_atv_repair_manual_download13bdr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380682/normal_5fca857a655e1.pdfIn PDF document text
    • https://lifalaril.weebly.com/uploads/1/3/4/8/134883644/60ed7d58fd7b6b.pdfIn PDF document text
    • http://callipakk2.site/online_taiwan_visa_formykaj8.pdfIn PDF document text
    • https://surigogalabilix.weebly.com/uploads/1/3/5/9/135961506/dupufewokaker_wedure_redazedazoxoze_tuguzoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472766/normal_6015d6e2b1cb5.pdfIn PDF document text
    • https://cdn.sqhk.co/mofipife/cAjdJY3/how_to_draw_a_cartoon_girl_face_easy.pdfIn PDF document text
    • http://bukuketefiwuji.iblogger.org/71637654984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_60283645f3acf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407316/normal_5fd9050d8d8f1.pdfIn PDF document text
    • https://nudusomezuriful.weebly.com/uploads/1/3/5/3/135387444/3a74ff.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/jheDRjj/20900399111.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460447/normal_600ae57669682.pdfIn PDF document text
    • https://salofapaj.weebly.com/uploads/1/3/4/3/134314320/74423.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492529/normal_5fcd65c17239e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488332/normal_603166a466ffe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480170/normal_6011ad32bad14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xetoluwe.epizy.com/solving_radical_equations_word_problems.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_off0000fc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC42 5836 bytes
SHA-256: 74c0e1681b9bc6cb9daa28ab6d308ea7ca7475ca9d858cde19280969462e76d8
font_01_sfnt_off00011011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11011 10808 bytes
SHA-256: 2ecb6d64e80a1dc83e0297dae5b94332fd9a405d34458da09bad064623821fb4

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