Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77817fbac73b886…

MALICIOUS

PDF

70.9 KB Created: 2021-01-31 17:46:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ac1f4ee005869b1444c25de909fa145e SHA-1: 539e5c6cfde720f9e9246a4501b8fca2ccd7015d SHA-256: f77817fbac73b88669e5d4e62cec7d5c45ce37c0fca9ffcfa10a434cf8b9c71f
186 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. Several heuristics indicate this is a malicious PDF, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. The presence of numerous disposable domains and the structure suggest an attempt to lure users to potentially malicious content or phishing sites.

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://crophysi.ru/123?utm_term=freezer+bag+cooking+pasta PDF link annotation
    • http://my-favshopf.online/photoshop_cs6_license_key_free2ou4p.pdfIn PDF document text
    • https://cdn.sqhk.co/junulevi/30RONE6/developing_strategic_management_and_leadership_skills.pdfIn PDF document text
    • https://paguzijap.weebly.com/uploads/1/3/1/4/131453408/1fbb07a78c4.pdfIn PDF document text
    • http://lofitner.buzz/61759549089waxqf.pdfIn PDF document text
    • https://cdn.sqhk.co/zisujidixa/eAfjjia/48452527336.pdfIn PDF document text
    • https://feroxetisilujux.weebly.com/uploads/1/3/1/4/131409167/vimofidekase_wufemejagazuzi_werigemezala_vijeb.pdfIn PDF document text
    • https://xonatusapu.weebly.com/uploads/1/3/5/3/135391421/lumuxenabogu-xalut.pdfIn PDF document text
    • https://wufikaxom.weebly.com/uploads/1/3/4/8/134883002/xosopowume-bedagar-nasogex.pdfIn PDF document text
    • https://cdn.sqhk.co/buruvalufe/nbggiiF/mafadawowisava.pdfIn PDF document text
    • http://runmasten.online/arianna_huffington_bookstdtvn.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovipawe/FjdjfIX/castle_wreck_level_2.pdfIn PDF document text
    • https://cdn.sqhk.co/zamepeja/idiimZT/the_zombies_time_of_the_season_chords.pdfIn PDF document text
    • http://wrinklestiltskin.com/xematesamaganoxilarowgm0e.pdfIn PDF document text
    • https://dipitamadupod.weebly.com/uploads/1/3/4/8/134882687/2550475.pdfIn PDF document text
    • https://fasukawoj.weebly.com/uploads/1/3/1/4/131453618/1192519.pdfIn PDF document text
    • https://cdn.sqhk.co/relulapezele/djhgclS/kenanolevufifeg.pdfIn PDF document text
    • https://mosivupidener.weebly.com/uploads/1/3/1/6/131637589/7832350.pdfIn PDF document text
    • https://dasukixarukawo.weebly.com/uploads/1/3/2/8/132814138/zivurakujami.pdfIn PDF document text
    • https://cdn.sqhk.co/puwukuwos/jaCjfhb/snow_bros_3_game_free_download_apunkagames.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://najaxobefirag.epizy.com/23250626828.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_off0000d861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD861 5276 bytes
SHA-256: bb930b4f0d80c9d275583376533b6733a2905886f3055f2c2a9880e946ff279b
font_01_sfnt_off0000ea75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA75 10464 bytes
SHA-256: 1d4d3c7881a7509a53c2dc3257a8b382cd5c878070198d7438b00accfc3a939d