Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44953ad08354b0c…

MALICIOUS

PDF

74.0 KB Created: 2021-03-03 18:40:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3b97d23bd32904eb59fb5b78b67fad2a SHA-1: eebb9d4c90283aa3caf26130389f1c56de6af82e SHA-256: a44953ad08354b0cf5cb8de825fd8de0adeae3eab286d95fd3f76f49a8a682f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the structure and embedded URLs point towards a spearphishing attachment designed to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=model+acsd1g+manual PDF link annotation
    • https://cdn.sqhk.co/levuzivanu/g8qhcji/gagabigituvoxobolesawa.pdfIn PDF document text
    • http://prizinsta365.website/nate_the_great_and_the_stolen_base_freeb4jrg.pdfIn PDF document text
    • http://tacfitproducts.com/crochet_bunny_doll_patterns_free0762n.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/cghvN8f/king_oddball_xbox_series_x.pdfIn PDF document text
    • http://natalonofawoba.22web.org/vebadejubulufusajaj.pdfIn PDF document text
    • https://cdn.sqhk.co/basinasedu/cibaqKX/76742566929.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/YfihAx2/roku_remote_online_use.pdfIn PDF document text
    • http://sizegivip.22web.org/trigonometric_identities_1_worksheet_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://loluwoje.epizy.com/zebijekisuvovuzaxere.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/congruent_shapes_worksheets_8th_grade.pdfIn PDF document text
    • http://bukinajomo.epizy.com/tenibusiz.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_off0000e4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DE 5220 bytes
SHA-256: 8686e3334bbbafbff9735e8321edd5025a518c2d4a23493fc1bc4d98d9ee97fe
font_01_sfnt_off0000f6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A3 10892 bytes
SHA-256: 08259fae8e0adef34fe48ee7d067a0c26356d414d6efda9ca01eded1879fcc78

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