Malicious PDF — malware analysis report

Static analysis result for SHA-256 623fec2918d4f27e…

MALICIOUS

PDF

75.1 KB Created: 2021-04-05 00:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4ec9ca6eb16ac74b782dee1fc25f19bb SHA-1: b10366bdafc136eb2a8b4bf37a4ba2f8faf3f498 SHA-256: 623fec2918d4f27e7bbd498059c7166e5d86993b4357cf2ba0e5cb511bb76118
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 lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though truncated and obfuscated, references 'Cyberpunk 2077 patch 1.06 details', a common lure for distributing malware or phishing for credentials. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://dugedepap.ru/strik?utm_term=cyberpunk+2077+patch+1.06+details PDF link annotation
    • http://zumewidife.mygamesonline.org/vimunabilax.pdfIn PDF document text
    • http://fapasevusiledap.mygamesonline.org/pujodowokoxo.pdfIn PDF document text
    • http://kinorio5.xyz/nifilagudejovunineg8ve2r.pdfIn PDF document text
    • https://xinozujo.weebly.com/uploads/1/3/0/8/130874257/4874940.pdfIn PDF document text
    • https://liletalezawo.weebly.com/uploads/1/3/4/5/134591830/vuzekuselexug-bibanusufun-biviwageboxovin-gufuwixizij.pdfIn PDF document text
    • http://kitukotobov.medianewsonline.com/83787049061.pdfIn PDF document text
    • http://kirudikegopoded.sportsontheweb.net/gizimusu.pdfIn PDF document text
    • https://zakiguranul.weebly.com/uploads/1/3/4/4/134480990/molifejiwenipirozez.pdfIn PDF document text
    • https://ganafotereko.weebly.com/uploads/1/3/1/1/131164127/3030454.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/duruvarimamekinozi.pdfIn PDF document text
    • https://rigegafotu.weebly.com/uploads/1/3/0/7/130740045/labono-kufumulu-xuvaw-mekubizitapit.pdfIn PDF document text
    • http://vekvelo.ru/62221146493yvg1h.pdfIn PDF document text
    • https://basurujilitafap.weebly.com/uploads/1/3/4/5/134595952/fosemerulipimuduge.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wogulixa.epizy.com/fabricio_carpinejar_livros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5abf11d4-8863-477b-8740-03d0f0f272db/how_to_track_weight_loss_measurements.pdfIn PDF document text
    • http://wesijulevevomo.rf.gd/romeo_y_julieta_reserva_real_nicaragua_magnum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cdfd4f2-8363-4746-8d6b-d21de636775e/18173420219.pdfIn PDF document text
    • http://pilomewolax.epizy.com/vidalupapabupokovafub.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_off0000e58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58F 5964 bytes
SHA-256: 663a36d165810ddf747d8f9c64ff9996859366d2d5f261963e0f1d2f3219d767
font_01_sfnt_off0000f9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 10936 bytes
SHA-256: 82fc417def28cfec6099d771eb86b987cf59f5722531384b6f9458e94af8a9b8

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