Malicious PDF — malware analysis report

Static analysis result for SHA-256 25123dc88520203e…

MALICIOUS

PDF

73.4 KB Created: 2021-05-31 11:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4f868fa6449dbc234b90e02cf7ce2d62 SHA-1: f7e9cfbc8c04a6d242ad727501fb35dcad4f3efd SHA-256: 25123dc88520203eb4a6e9f58f080dca20fe260c470c3df4d28ecb90b54b7711
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate malicious content, specifically classified as phishing. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://zajinet.ru/strik?utm_term=what+to+give+sam+stardew+valley PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451755/normal_5ffbcfcce7aae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491445/normal_6022e8c19bc78.pdfIn PDF document text
    • https://figerifefiter.weebly.com/uploads/1/3/4/3/134343277/metukozerizuwotarire.pdfIn PDF document text
    • https://wirujiko.weebly.com/uploads/1/3/4/9/134900452/peviwuto_tobobal.pdfIn PDF document text
    • https://rimesukanol.weebly.com/uploads/1/3/4/7/134746435/8583399.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489259/normal_6057e7b344823.pdfIn PDF document text
    • https://lipuguxe.weebly.com/uploads/1/3/0/7/130738524/1162622.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410678/normal_602c52063b1b5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/019923d8-65ee-4fc0-9480-b7c8a6ac0391/46105569433.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00f7e383-f944-4023-8dd0-22a60b3c544d/hack_zombie_tsunami_full_pet_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fad4725-3ae0-437a-96a2-7966c32edb7a/72604384197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3129054-ec5a-4436-85af-157330040e26/ximamofisepo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ff3c54e-e2b0-4056-9d71-98c7ae2bdb0d/modal_verbs_spiegazione_in_italiano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88560dc0-65e0-4b03-bd0c-db5761f3d449/dns_323_firmware_1.09_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce024c06-0b47-4838-8a8c-0201ab71a770/scary_stories_to_tell_in_the_dark_monsters_illustrations.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_off0000df24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF24 5504 bytes
SHA-256: 3957b388b8f402b5b504756ff207d2baf9946689560b56f62448dfe0be31272d
font_01_sfnt_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 11924 bytes
SHA-256: e901ce998cdaf2409c2abb04b32806a79d89cc12e668c4681cb8eb8c606067a3

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