Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb9e302e17e2fc8…

MALICIOUS

PDF

140.5 KB Created: 2021-04-14 19:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 57ca9c8ba843b0ed18c90cf8b565e8e4 SHA-1: 72dce33e416ef6c34bd9b2290f37c6475e4cdaed SHA-256: ddb9e302e17e2fc83f000e330668156939fb71cd1c12c267a5c780f4aff653b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('ponafet.ru') and another to a link farm ('help-business-media.com'), suggesting a phishing or malware distribution attempt. The presence of a 'utm_term_redirector' heuristic further supports the idea that these links are designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/strik?utm_term=buffalo+%25E3%2583%25AB%25E3%2583%25BC%25E3%2582%25BF%25E3%2583%25BC+wzr-600dhp2 PDF link annotation
    • http://help-business-media.com/jirupanoj8oikx.pdfIn PDF document text
    • http://agent-ritual495.online/what_is_meant_by_public_speaking_anxiety2hgpk.pdfIn PDF document text
    • http://resimpub.com/95077435172qg514.pdfIn PDF document text
    • http://clubstore.pro/hattrick_meaning_in_telugu67kln.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/5970864f-b8cb-44d8-a199-f6a8a55976dd/head_first_design_patterns_10th_anniversary_edition_covers_java_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c88f6c96-29cf-4df1-866d-f0709869aae3/60989468213.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28b37898-722b-4706-b5c1-4f880ccd3324/61916314361.pdfIn PDF document text
    • http://ravojovi.epizy.com/brexit_agreement_document.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/defop.pdfIn PDF document text
    • http://bozudob.epizy.com/aao_na_haveli_pe_mp4_song.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/chattel_band_video_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3606564a-cf5c-438a-8206-578266df7dea/82371906826.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1d75bd4-1592-4f4b-80a8-721935938aaf/xedotexebijoxo.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/viktor_shklovsky_art_as_technique_citation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c8d359b-3223-4a28-8823-8942326c2794/barowuzet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e488789a-1e31-491d-8554-c29bb749efb6/is_grief_counseling_free.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA33 88064 bytes
SHA-256: 3e08a95b29f724a893f186ef568674580dec50e30510657d5e991e5fe901b38f
font_01_sfnt_off0001df0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF0B 3356 bytes
SHA-256: dcb78710c23bc669af8b4aef22695b009257f541041b56569a3022401e3ee9c7
font_02_sfnt_off0001eaf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EAF2 5600 bytes
SHA-256: 4c8102bbca1112e9383470150a7b0833425f5ff0430bafa0d533531a954809b9
font_03_sfnt_off0001fe1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FE1C 10336 bytes
SHA-256: 0cd35b7e9b96505da7d529fa8441baa764c273256e831dcafd1810f8bbc0e44e

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