Malicious PDF — malware analysis report

Static analysis result for SHA-256 2497b1e071e45d43…

MALICIOUS

PDF

70.9 KB Created: 2020-12-19 22:35:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7bd45d1d6c3704b61071c3b510469087 SHA-1: b4e7a7a936182cae5befc204684d0299d2f671ba SHA-256: 2497b1e071e45d43b61e57c2c99cf477733d1e9a9a444ee436d9b895bb7470b7
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users. One prominent URL, 'https://trafffe.ru/strik?utm_term=track+changes+in+google+docs+app', is presented as a lure related to Google Docs updates. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/strik?utm_term=track+changes+in+google+docs+app PDF link annotation
    • https://nonaxoboru.weebly.com/uploads/1/3/4/4/134467623/ef8d5ec985e5e6c.pdfIn PDF document text
    • https://memarexegota.weebly.com/uploads/1/3/4/3/134366516/1844303.pdfIn PDF document text
    • https://jisogixisizula.weebly.com/uploads/1/3/4/3/134328009/a5b86c2c74.pdfIn PDF document text
    • https://feloxoxux.weebly.com/uploads/1/3/4/0/134000485/07ab4434249cd94.pdfIn PDF document text
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/vazasagitute-rojanavivevaj-vazil.pdfIn PDF document text
    • https://likosevatifipol.weebly.com/uploads/1/3/4/5/134584064/7672238.pdfIn PDF document text
    • https://bogezemobazuv.weebly.com/uploads/1/3/1/8/131856224/noboxowijavopukevin.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/2824c097-ae61-4b13-ac36-b5a1b56d45f0/26414691053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b7131dd-be42-4d80-9739-1b141e28c8c6/adam_savage_cosplay_totoro.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/57300620453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25a2183f-8a7d-460d-835d-74ff470a5d40/punnett_square_practice_worksheets_for_middle_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a857ef64-daf3-4a02-965d-5d18de222978/venogivakabolun.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/noaa_aviation_weather_report.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_off0000c957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC957 5056 bytes
SHA-256: 21234c75e6cf04a3e18d7b2a7f98e0b880ec9d3753074d2df5060f22c17c9893
font_01_sfnt_off0000da68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA68 11156 bytes
SHA-256: ef0b08c21648af21d720ebc00156e80a3cf1f998a1fdffa2b87fa5cbb381f287
font_02_sfnt_off00010055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10055 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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