Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e4056dcf573bd9a…

MALICIOUS

PDF

76.6 KB Created: 2021-04-06 08:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 33879e59b46307ae196cfa2d757c9a32 SHA-1: 7531ff09685ab937ac67a52029cf09c631031ac6 SHA-256: 2e4056dcf573bd9a11c4d2f42c55760cb31ca4724bdb806d0d12934eda32afae
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to direct the user to a site that likely hosts a malicious payload or phishing content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/award?keyword=definition+of+management+accounting+pdf In PDF document text
    • http://doguzunagenuxo.22web.org/kovulaboferon.pdfIn PDF document text
    • http://help-ruleviolation.com/aylesbury_vale_district_council_freedom_of_informationoihe5.pdfIn PDF document text
    • http://getveran.site/29512896521g8sx8.pdfIn PDF document text
    • https://cdn.sqhk.co/muxaferamet/JYFhOjc/pocket_soccer_dice_game.pdfIn PDF document text
    • http://qqkaxes.xyz/talunabekewusasojursbj.pdfIn PDF document text
    • http://gelufose.scienceontheweb.net/xefarororezugexaletem.pdfIn PDF document text
    • http://udilische.club/fagosmm3a0.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/Jjidbhi/emoji_maths_puzzles_with_answers_hard.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://d1b6b380-f15b-462b-86b5-0b089ba7d90d.filesusr.com/ugd/f99a33_522b26264fd44ec0adcf7911255ac61f.pdf?index=trueIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_285b7ce6f7114af092b23ec9476d8a48.pdf?index=trueIn PDF document text
    • http://gubawakelu.onlinewebshop.net/2813344616.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/mathematical_statistics_by_john_e_freund_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/introduction_to_embedded_systems_software_and_development_environments_solutions.pdfIn PDF document text
    • http://xaxubel.rf.gd/28995087978.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/42313438883.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/introduction_to_machine_learning_with_python_andreas_mueller_free_download.pdfIn PDF document text
    • http://putuvapade.epizy.com/81054793110.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_off0000e37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37A 5052 bytes
SHA-256: 68d6bb78d4752f73d06ebb7dd9dafe2a26307a77fc61da218003a762a820c94b
font_01_sfnt_off0000f49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49A 9952 bytes
SHA-256: 78c3234b77d8eaea1351bdc96423c711a203f07808977d57bdd85cac7f55bb6f
font_02_sfnt_off000116a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A2 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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