Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1dc6c9c264a041…

MALICIOUS

PDF

88.9 KB Created: 2021-04-24 06:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 286b0437286dc4bfa8c50ac1aa61911d SHA-1: 22be1b58d02c2233a84d707cea65760e84c42c3e SHA-256: 0f1dc6c9c264a041a471450541a82cb512de373368ae20570946fdc2c4fee619
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 of which point to disposable hosting and are likely part of a link farm or SEO manipulation scheme. The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=epson+perfection+v550+photo+scanner+amazon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473359/normal_604cd88744fc7.pdfIn PDF document text
    • https://xifugewelude.weebly.com/uploads/1/3/4/3/134353264/popasuda_vakoxegido_difufebulasasi_zidurejogemaw.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/Y0jjfjb/dinghy_for_sale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390661/normal_5ff8cbe2cd427.pdfIn PDF document text
    • https://sixapinipuso.weebly.com/uploads/1/3/1/3/131384402/bojetan-mukuti.pdfIn PDF document text
    • https://vitovoraf.weebly.com/uploads/1/3/1/1/131164311/bitutejijoniraz-xepigelexupige-numozu-xupixon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453764/normal_60125fc494e12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409254/normal_5fef428edd639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405953/normal_6052331812c24.pdfIn PDF document text
    • https://timokejega.weebly.com/uploads/1/3/4/4/134454798/mafigilux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468286/normal_603f97941c215.pdfIn PDF document text
    • https://cdn.sqhk.co/bizewavaxug/mgfhbDs/dijunodosivepupo.pdfIn PDF document text
    • https://muwalivom.weebly.com/uploads/1/3/2/6/132695892/6434702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423462/normal_600bfc13e9fdf.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/I6ib7CI/lizepow.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/c3ddf5c9-be3f-4b5f-b5d1-6a7db1a01562/senuledexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7d11d18-262d-4e60-8ffe-b68c0a5fa9cd/78824538649.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29305960-f14c-455a-badf-45de6a21363c/tirepugalazexurig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee359817-1232-47fe-bd42-76afba3b3b07/dijibemazalujerajilak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16f9b714-ee37-4057-af33-0e40a7110993/357658532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb863612-0c82-46ac-8763-a00d1b23d271/70206216692.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4B 5344 bytes
SHA-256: e6065c7e1f00c874b580801c1a799d99921f64a9920adce7a5e4ef84106375d4
font_01_sfnt_off00012057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12057 12224 bytes
SHA-256: c7ee40e59dfd79485948a52fe56f799dc413ba14343c858fba2d3f46c9d1bde4
font_02_sfnt_off00014817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14817 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3