Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d66e356ede320d…

MALICIOUS

PDF

63.8 KB Created: 2021-02-28 18:22:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 27177bb034e4730d669099524d0e2164 SHA-1: 23f79d40392e0a08376727bb6b68ae65e2627973 SHA-256: a4d66e356ede320d04e910a4a48a912e6fc156e4ac28f085fc50159049735216
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a technique often used to distribute malware or redirect users to phishing sites. The heuristic PDF_SEO_LINK_FARM specifically flags this behavior, indicating a large number of links within the document. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://xajibur.ru/strik?utm_term=vampire+diaries+fanfiction+damon+throwing+up PDF link annotation
    • https://malavaxun.weebly.com/uploads/1/3/4/0/134018228/782217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502567/normal_602100609d77f.pdfIn PDF document text
    • https://pomavedakese.weebly.com/uploads/1/3/1/8/131871772/rorexaz.pdfIn PDF document text
    • http://xobuxok.22web.org/patidirifexagujukujaza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/breakdown_lane_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/app_world_blackberry_9900_offline.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/11690417097.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/homemade_christmas_table_favours.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/microsoft_word_2013_business_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/allu_arjun_all_movies_list_songs.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_off0000bdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDEF 5592 bytes
SHA-256: 813eafd2b2093ad322e8ccba47ffce03974f55c4484a7d6e6f24af542da2c930
font_01_sfnt_off0000d0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E6 9880 bytes
SHA-256: bb6f4c80656f7d18710c0bd97174887593bc3f78d5ca007e188574800126f025

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