Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63953ad75a4a427…

MALICIOUS

PDF

77.9 KB Created: 2021-04-26 04:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 280983c727c38bd80159270db29ac412 SHA-1: 26a0e0df87063f65e121f714ce341bd0c1213989 SHA-256: a63953ad75a4a427b806a4859189febf615958b3d13b999c23e8c10bff27c0f3
126 Risk Score

Malware Insights

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

The PDF file contains multiple external URIs, with one specifically appearing as a search result for a commercial product. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=how+much+is+off+white+nike+air+force+1+mca PDF link annotation
    • https://cdn.sqhk.co/zidodovare/hcgINGA/57040311962.pdfIn PDF document text
    • https://cdn.sqhk.co/tilafukefuwe/Khcjegy/sevaweluvirisurexolixubad.pdfIn PDF document text
    • https://gawuwusirijer.weebly.com/uploads/1/3/4/1/134108670/zenaxeko_medizononex_wuruximusot.pdfIn PDF document text
    • https://cdn.sqhk.co/wufotubi/ijgGhgQ/87824474137.pdfIn PDF document text
    • http://zuwifipenabed.medianewsonline.com/tipos_de_energas_renovables.pdfIn PDF document text
    • https://norusukesalija.weebly.com/uploads/1/3/4/3/134356509/4947.pdfIn PDF document text
    • https://cdn.sqhk.co/simubekoz/ghjgDYR/hidden_objects_free_games_4_fun.pdfIn PDF document text
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/janapaledi_wotunofapagaji_denuwejizepiw.pdfIn PDF document text
    • http://nitapida.mywebcommunity.org/5480770890.pdfIn PDF document text
    • https://cdn.sqhk.co/silakozafi/g6vXiYG/47260534337.pdfIn PDF document text
    • https://cdn.sqhk.co/samivegin/jvigegc/carotida_interna_y_externa.pdfIn PDF document text
    • https://cdn.sqhk.co/gobavata/FsRhbje/switzerland_covid_19_border_restrictions.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/440f3a78-bb9c-443b-ac07-e502b864865f/pedagogy_of_the_oppressed_preface_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf81519-d0ba-428f-8e47-942058130463/good_machine_learning_books_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/130d4128-1cd1-4bd5-9654-935d9549a366/star_trek_2009_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09ebba10-521d-4319-8d64-5f97fd580503/galaxy_a10e_water_in_charging_port.pdfIn PDF document text
    • http://nujilexulajuwup.atwebpages.com/89073503945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/621847a8-a4bb-4bbe-b4d5-97e9c017e6c2/24103350523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee3de4a3-5ecd-423a-8535-a7099139817c/91635605855.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_off0000f31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31A 5260 bytes
SHA-256: c2bf3c43d2458449fef90d8c2339b6145ee316333a2f53cb2feacb9ed10ccf04
font_01_sfnt_off000104e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E8 11432 bytes
SHA-256: a1826bbd5deabc42807c6be6fd7da6549b4ddb33c7169715e9077401fe47dd1e

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