Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb8533874d16c83…

MALICIOUS

PDF

99.2 KB Created: 2021-02-28 10:40:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b5623b6af19ca2f04c48e28b60bd690a SHA-1: ec2a4ac83f244b15d116477eecc202704f71f2e9 SHA-256: ffb8533874d16c83cfa46247e4fed43b430f13de38744fab5e001e2e7c3b47f8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The primary URL, disguised as a search query, leads to a site that is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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 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://botokaw.ru/123?utm_term=what+kind+of+insects+does+arizona+have PDF link annotation
    • https://retuxuzuj.weebly.com/uploads/1/3/4/6/134688644/dasuleza.pdfIn PDF document text
    • http://blue-tick-central.com/zadijopxov6.pdfIn PDF document text
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/e1cda.pdfIn PDF document text
    • http://santaparker.store/77876025268gup2x.pdfIn PDF document text
    • http://kyponnik.online/783660122644ctqm.pdfIn PDF document text
    • http://wspring.space/90_s_dance_music_ukhrxpt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421062/normal_600c903284796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475872/normal_6021667a691b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378386/normal_601dad4b2decb.pdfIn PDF document text
    • https://cdn.sqhk.co/bekutojeke/8iiqgdt/medieval_town_life_facts.pdfIn PDF document text
    • http://rkconstructionsucks.com/what_is_the_definition_food_microbiologyvxuah.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_601405dccc347.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xofogijatoli.epizy.com/38470391484.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/authorization_form_template_example.pdfIn PDF document text
    • http://vutakeba.epizy.com/acc_guidelines_atrial_fibrillation_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/50612208289.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_off000149bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149BB 5264 bytes
SHA-256: 9a8b65912cfedb4d60b18cb60083c789ef83e538ae90cb30d0106ba073859f86
font_01_sfnt_off00015bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BBD 10448 bytes
SHA-256: 48b97a1e79fcd3f88eaa85a2ad95dbb1b5f1f1c09e960bd4b9b0122a75460e54

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