Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4e40ce25e5aa9f…

MALICIOUS

PDF

75.9 KB Created: 2021-03-16 07:58:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d441276909d7ccb5e417981917e3a104 SHA-1: 29dc3d04db790ed6854d159a38ca85bb942356a9 SHA-256: ab4e40ce25e5aa9fe4d577da8ffdbce82a462e18fc1e9983dac85a1ae11e21ef
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique commonly used in link farms to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://golowaki.ru/123?utm_term=mailchimp+form+fields PDF link annotation
    • http://weinmvc.net/mori_seiki_mv-35_40_manualcczt4.pdfIn PDF document text
    • http://creampiepow.club/50714154320tkcf.pdfIn PDF document text
    • http://help-business-media.com/what_is_the_best_3000_psi_pressure_washeryxbo0.pdfIn PDF document text
    • https://xepezexitig.weebly.com/uploads/1/3/0/9/130969834/buwupadomosalawo.pdfIn PDF document text
    • http://kind-insta.site/yellow_colour_wallpaper_hd_free_downloadtye1a.pdfIn PDF document text
    • https://welajewovire.weebly.com/uploads/1/3/3/9/133999455/2511b34.pdfIn PDF document text
    • https://kotekadugufed.weebly.com/uploads/1/3/6/0/136086248/4083891.pdfIn PDF document text
    • http://copyrightproblem.com/ice_hockey_stats_sheethh08l.pdfIn PDF document text
    • https://moxeduve.weebly.com/uploads/1/3/0/8/130814104/dijakobod_lezamajiked_pijodiwewof.pdfIn PDF document text
    • https://vonepegoparopew.weebly.com/uploads/1/3/4/3/134352316/a086645f8f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_6d6301f3ae604704b74c29ee32349e5a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/50227299468.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/duxokugiwodolimemilagu.pdfIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_bcfe45fa3c8446479f27a29e13517a0b.pdf?index=trueIn PDF document text
    • https://d7b50aa0-fea3-4edc-ba9e-4ed0094b0c60.filesusr.com/ugd/7f614e_596894fea87a4d098011b465fecca540.pdf?index=trueIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_7d5225bb548d48a0940807574d7d1461.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bugutaj/galbraith_affluent_society.pdfIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_7dfdc5c49f5649a4909368c129bf3359.pdf?index=trueIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_96dccc2ba3154b41822eced79d0897a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/intel_dq965gf_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/rupekavaxutel.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_off0000eda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA3 5400 bytes
SHA-256: 7a037964c97b86ff8ac6381d05ca381466611bffc8bf50aead0d87c8a026de7c
font_01_sfnt_off0000ffe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE3 10272 bytes
SHA-256: 4eeb0cc5346d57147169250443de8527cea27c161ae9b975e537dc35005bfad5

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