Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ffbeb1c6016f4d…

MALICIOUS

PDF

79.6 KB Created: 2021-03-27 12:04:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ffa6de8ed870a026db3312a754ee7bb2 SHA-1: f062e4ddb32559640d788405e08fbfb5dcfbda7e SHA-256: 62ffbeb1c6016f4dd504e24df1b8d11e51307060b058ec50d295b848c15ee867
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and a phishing attempt. It contains numerous external links, with one prominent link to 'vilenefex.ru' that appears to be part of a malicious SEO strategy. The ML classifier and ClamAV also strongly indicate maliciousness, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=how+to+get+hp+deskjet+2700+online PDF link annotation
    • https://cdn.sqhk.co/gewanunu/idhhBpR/warawox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446152/normal_5fedf0906d099.pdfIn PDF document text
    • https://cdn.sqhk.co/sutadejuna/micFjc2/dazusebasuvujit.pdfIn PDF document text
    • http://malipawiw.22web.org/mi_planta_de_naranja_lima_descargar_libro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409413/normal_60466f7aab28b.pdfIn PDF document text
    • https://pajenugemin.weebly.com/uploads/1/3/4/6/134677616/bavudofosa.pdfIn PDF document text
    • https://bumovewadenol.weebly.com/uploads/1/3/5/3/135318567/016a950ffede.pdfIn PDF document text
    • https://cdn.sqhk.co/rizijuwet/fhhbfH8/best_road_bike_racing_helmet.pdfIn PDF document text
    • https://buzijivugaza.weebly.com/uploads/1/3/4/7/134709386/8643672.pdfIn PDF document text
    • https://gutamunimidujad.weebly.com/uploads/1/3/4/6/134667749/dixesuruvumomutig.pdfIn PDF document text
    • https://buzijivugaza.weebly.com/uploads/1/3/4/7/134709386/nitob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/bab93dcd-966d-40a6-ac63-551c692635e9/john_deere_48_in_deck_belt_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcf0adb7-e502-47f6-a37e-17f55f6f874d/good_captions_for_pictures_2019.pdfIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_fdefcb6498394a118db1998b6935b3ed.pdf?index=trueIn PDF document text
    • https://43e3b293-20b6-4b74-9f7d-0eefffb4d2df.filesusr.com/ugd/11595e_b2674d60bff94f398129efe96298456a.pdf?index=trueIn PDF document text
    • http://sedijinuv.epizy.com/c_programming_language_examples.pdfIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_6d645c41b0fe44e8afba6715a0fd4999.pdf?index=trueIn PDF document text
    • http://pobevejilu.rf.gd/pilexekeguzugaludileziroj.pdfIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_0a21f88ff3ef44c4bc7233936c351969.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB12 5252 bytes
SHA-256: 66d0067dbac397e4435ae88f334eb8e565547a4239ab9305e3266068e2a3a06c
font_01_sfnt_off0000fd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD13 11148 bytes
SHA-256: acf2bf120e8649e5dbb09c76ed73a8df7ab28d7b65caa78830180f05616690ae
font_02_sfnt_off0001231c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f