Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f9efef8f3ac56c…

MALICIOUS

PDF

82.7 KB Created: 2021-03-14 11:58:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f1920143e097a1f737d20d64f00f44a9 SHA-1: 7dff8d6e1b0e02d15754a563a1226c68602c5b27 SHA-256: b7f9efef8f3ac56cb37b08148d6deab497119d2568872acd777a0228b89c8a77
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one prominent URL pointing to a suspicious domain associated with phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing campaigns. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://kuzutuzo.ru/strik?utm_term=beats+studio+3+blue+walmart PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4456984/normal_5ffb3a08014a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475853/normal_60134eb5545f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407788/normal_5fd84c4718bd4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394068/normal_5ff0d07b1f24c.pdfIn PDF document text
    • http://werenntaq.online/ocr_gcse_maths_past_papers_answersqv6dd.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/muvexi.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/manual_radios_midland_gxt1000_en_espaol.pdfIn PDF document text
    • http://vilopeg.xyz/wekuxubarebodolurufcnas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409118/normal_5fc9a90b500fa.pdfIn PDF document text
    • http://gexulogoben.sportsontheweb.net/mibunopenelomufukebiwi.pdfIn PDF document text
    • http://crispyset.online/35947206618cj8a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475209/normal_5fe5a168abd78.pdfIn PDF document text
    • http://armlur.space/dezejogiximorapanoogh76.pdfIn PDF document text
    • http://bestrongbyg.com/shark_steam_mop_vacuumdksfo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420018/normal_5fc74d19c0536.pdfIn PDF document text
    • http://curvepreloved.com/venice_travel_guidelinesriqs2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415052/normal_6049eb1ba4bef.pdfIn PDF document text
    • http://sodahq.pro/how_to_connect_ipad_to_hp_printer_without_airprintklxgy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_604d3c1bbaa20.pdfIn PDF document text
    • http://reduslim-europa.site/mameronasazezattwyar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://64db0a9d-d2b7-4705-beb9-75cca7f1d068.filesusr.com/ugd/4c6241_b825be0e75194254b1ea52900886a136.pdf?index=trueIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_d6c70cf1ec344c68a0b785926c787f34.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED91 5416 bytes
SHA-256: b011dcf7a836f84f8971827f8fc036791d07a27fea4f99607dadc8c975dc18b8
font_01_sfnt_off0000fff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF1 11644 bytes
SHA-256: 1d30e10b597963fdde752c9f330c853d473799d816914b197e100e4026453b2c
font_02_sfnt_off00012772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12772 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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