Malicious PDF — malware analysis report

Static analysis result for SHA-256 f852c9c2eb462344…

MALICIOUS

PDF

78.3 KB Created: 2021-03-24 22:15:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ad790caa5bc696a6264469804ca2115b SHA-1: d00e7d28713dfb013ff21239ba15321b6af7161c SHA-256: f852c9c2eb4623446a8d73f4ff65b639731ca4180a3b68a1ed0091abe8342105
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/strik?utm_term=15+day+fit+body+challenge+meal+plan PDF link annotation
    • https://pedexanagokol.weebly.com/uploads/1/3/4/6/134635549/meravizapesex_momibukak_jejoluvoponemol.pdfIn PDF document text
    • https://rebejudan.weebly.com/uploads/1/3/5/3/135316845/faxir-lugufipur.pdfIn PDF document text
    • https://fenorepaxok.weebly.com/uploads/1/3/1/8/131856491/72eccba.pdfIn PDF document text
    • http://nadipewin.mywebcommunity.org/how_many_carbs_are_in_a_small_wendys_nuggets.pdfIn PDF document text
    • http://xalapuzim.sportsontheweb.net/nebemujetevonuvize.pdfIn PDF document text
    • https://wosapinilesodiw.weebly.com/uploads/1/3/5/3/135347506/jalivesid_kifuxik_lukadef.pdfIn PDF document text
    • https://gepumisi.weebly.com/uploads/1/3/4/5/134517510/movug_gifuwogurizemas.pdfIn PDF document text
    • https://sizokagijabid.weebly.com/uploads/1/3/4/6/134652394/mowimevirivobat.pdfIn PDF document text
    • https://bezigetomesijag.weebly.com/uploads/1/3/1/0/131070469/zokuriwakuk-wemavifow.pdfIn PDF document text
    • https://lukazerud.weebly.com/uploads/1/3/4/3/134343231/575288.pdfIn PDF document text
    • https://tuxupifogufo.weebly.com/uploads/1/3/4/5/134594750/rujusovuxu.pdfIn PDF document text
    • https://gegosituvoxefo.weebly.com/uploads/1/3/5/3/135349754/746c432dc.pdfIn PDF document text
    • https://kifutojuwa.weebly.com/uploads/1/3/4/0/134017701/377255.pdfIn PDF document text
    • http://sujimelowakolop.medianewsonline.com/jufodozanidoguxijaru.pdfIn PDF document text
    • https://tuzuratodaf.weebly.com/uploads/1/3/0/7/130738639/ff096dc14e79c1d.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/83307548356.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_b8ef2189d1454ebea0893467985558cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/best_way_to_use_avent_manual_breast_pump.pdfIn PDF document text
    • https://17c3d818-7f64-4152-976a-2fa997d7a7be.filesusr.com/ugd/e2c250_7290a1922f97457e9e15a9555207517d.pdf?index=trueIn PDF document text
    • http://xuxerutiwuv.onlinewebshop.net/dafataletodakekutomujib.pdfIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_1a99a5a95bae4b8cbf560a820759a561.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/seriposuj/36392326179.pdfIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_d80ee8e7008444488acd4b3e2814441f.pdf?index=trueIn 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_off0000f0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 5620 bytes
SHA-256: 28cded5a3d753e95762124be9c55fb96e85254397ccb1dc45194f44e304bfa56
font_01_sfnt_off000103f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F0 11104 bytes
SHA-256: 77793b676fb56bf5640774abca13475720077624a888b93553b308d09688a855