Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c3226583ba007d…

MALICIOUS

PDF

78.2 KB Created: 2021-03-30 02:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ae5309d12a34c24932957d15a6bee52c SHA-1: 87356639739b64231247bd93a402a3fea2372116 SHA-256: 41c3226583ba007debe4b5049c9823e8bc3b8b6a69adbffc77a0c477018d334c
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and external URI firings strongly suggest it's designed to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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 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://soxebez.ru/award?keyword=aprende+a+dibujar+comic+anatomia+de+superheroes+pdf PDF link annotation
    • https://zisupozukubowad.weebly.com/uploads/1/3/4/6/134678668/zebutide-juruze-latisibunoto-juvoriresew.pdfIn PDF document text
    • https://dufavepuxafolim.weebly.com/uploads/1/3/4/2/134266173/sefek_zunev_kipuvosilutisal_velasix.pdfIn PDF document text
    • https://gokixojegesefa.weebly.com/uploads/1/3/4/8/134864476/sopunowadefe.pdfIn PDF document text
    • https://dezubawutojowi.weebly.com/uploads/1/3/1/3/131398539/18e13e2fd5.pdfIn PDF document text
    • http://bojidodug.iblogger.org/rpf_ancillary_2020.pdfIn PDF document text
    • https://rulakufip.weebly.com/uploads/1/3/4/4/134489053/a4d6654b5.pdfIn PDF document text
    • https://cdn.sqhk.co/vusunuvaka/jhjhwkl/balanced_meal.pdfIn PDF document text
    • https://noragunefide.weebly.com/uploads/1/3/1/6/131637841/22bedf51567f9.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/2ict5gj/download_games_total_conquest_offline_apk.pdfIn PDF document text
    • http://bidurevemoj.22web.org/crosman_38t_parts_diagram.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/fddad4af61.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/yUjhOie/kidafodalatariforinoporeb.pdfIn PDF document text
    • https://geripefuni.weebly.com/uploads/1/3/2/7/132740274/f67b6e55.pdfIn PDF document text
    • https://zutuwukesid.weebly.com/uploads/1/3/4/6/134624341/6163397.pdfIn PDF document text
    • https://cdn.sqhk.co/nupozifulija/d7hcjcR/nfl_sunday_ticket_cost_comcast.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxawexa/hjGoB1K/galaxy_battle_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://35057dd6-1d18-4acd-96c9-af3b7fddc7cd.filesusr.com/ugd/978dd5_2b4f697f671544098688007c1a25a911.pdf?index=trueIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_244bcda70854413c89b5a4ec191bb155.pdf?index=trueIn PDF document text
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_33c331ed0df94aceac7c6ec641eb263f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/fire_department_training_report_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/lefetedodupunumiv.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/pipozesuzaxokib.pdfIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_be2d8f0d62f944e2b149d4b27bb95669.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sixolose/6889678279.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/skin_station_diode_laser_guide.pdfIn PDF document text
    • http://lewimidofi.epizy.com/sefaxafomefa.pdfIn PDF document text
    • http://lawurukipajuxe.rf.gd/cyber_hunter_lite_apk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE286 5452 bytes
SHA-256: 4d878b00af176c6d1df49086b8fbefa32c75fbbff3a2f5ed6689647b48b92050
font_01_sfnt_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 11568 bytes
SHA-256: 122463e870af0ef4b2b5625b198e8e605ee234a96a5977304e88eb34d619e252
font_02_sfnt_off00011aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABA 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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