Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85271000bf7db15…

MALICIOUS

PDF

71.1 KB Created: 2021-06-12 09:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7606a32b661868810e833dbaa2aee076 SHA-1: 8b1aec4cad11bf64981e2cf1dfe64e19d662c31f SHA-256: b85271000bf7db1521361b833e17dd34bf7673922ba9cddd1be8c5ec11195b91
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and heuristic detections indicating it is a phishing or malicious document. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary URL, https://synerhu.ru/pbw?utm_term=harry+potter+violin+pdf, is likely the destination for a phishing attempt or malware download, disguised by the document's content.

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 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://synerhu.ru/pbw?utm_term=harry+potter+violin+pdf PDF link annotation
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/kivepijupotana_lopoz.pdfIn PDF document text
    • https://sowujapureku.weebly.com/uploads/1/3/0/9/130969862/4029843.pdfIn PDF document text
    • https://xawajedub.weebly.com/uploads/1/3/4/8/134886715/94a091d3afb4aad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fukibaso.pbworks.com/w/file/fetch/144750762/all_the_mods_3_lite_guide.pdfIn PDF document text
    • http://xugatun.pbworks.com/f/what_does_sunflower_kernels_mean_in_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4d266c3-0791-4eca-bb9e-8bb1695f754e/61443039073.pdfIn PDF document text
    • http://xudusuvo.pbworks.com/f/riluj.pdfIn PDF document text
    • http://pilujibos.pbworks.com/w/file/fetch/145155765/wagosekoxuwisojerowafeba.pdfIn PDF document text
    • http://wigonewakil.pbworks.com/f/senozaxibu.pdfIn PDF document text
    • http://redejok.pbworks.com/w/file/fetch/144561630/35045394421.pdfIn PDF document text
    • http://molitutolu.pbworks.com/f/polk_magnifi_mini_5.1_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6168a3c6-e4bd-4487-8be0-857662d53db0/dewalt_735_planer_stand.pdfIn PDF document text
    • http://bibosopimugo.pbworks.com/f/commando_1_full_movie_online.pdfIn PDF document text
    • http://juvudibip.pbworks.com/f/arranging_words_alphabetically_worksheets_for_grade_4.pdfIn PDF document text
    • http://kiduvipiza.pbworks.com/f/rotokap.pdfIn PDF document text
    • http://mogulobobis.pbworks.com/f/paxuj.pdfIn PDF document text
    • http://goxuluk.pbworks.com/f/evony_the_kings_return_tips.pdfIn PDF document text
    • http://kigofot.pbworks.com/w/file/fetch/145097766/ziguji.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_off0000da1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1C 4980 bytes
SHA-256: 2373cfff7110848015a5474be2da285724c5d270b30c69f4c5c10a75692221ee
font_01_sfnt_off0000eb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2C 10796 bytes
SHA-256: d8b722e717c74bc1415a8576df9e35d257cc32fcbecc49b0ac9b70ac61c2aa06