Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b101e78aa1ebd23…

MALICIOUS

PDF

78.5 KB Created: 2021-03-01 06:42:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 69dbd833fa9edbd48d9ae037fe25d0d7 SHA-1: d63b4275e82ed07f7cec33021eb88420e3fc28aa SHA-256: 0b101e78aa1ebd2367ae8265ef2da5b8467694afa46d1d6cacad5b8b1c9fe773
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords related to corporate social responsibility and environmental sustainability, suggesting a lure to disguise the malicious nature of the links.

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
  • 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://resalured.ru/strik?utm_term=corporate+social+responsibility+environmental+sustainability PDF link annotation
    • http://myimperfectmomlife.com/absent_minded_professor_movie_freebror1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476780/normal_60008f41c9e90.pdfIn PDF document text
    • http://scoretdho.best/fagofureruwip0v1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489586/normal_60314319bf510.pdfIn PDF document text
    • http://on-arenas.com/20245226742u0smz.pdfIn PDF document text
    • http://idealslim-ordina.site/50714761030a2w69.pdfIn PDF document text
    • http://worldhold.online/21715882940uhb94.pdfIn PDF document text
    • http://indohealth365.online/19054472148mnriw.pdfIn PDF document text
    • http://andyhong.blog/brain_training_games_for_adhdl5zy6.pdfIn PDF document text
    • https://cdn.sqhk.co/femokuxajuz/fPjchfH/xewiboloxid.pdfIn PDF document text
    • http://onlinekartiadesi.com/heart_of_iron_3_deutschland_guidezmtl4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387244/normal_5ff3b15c4e16e.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/KgcJjjj/82650126764.pdfIn PDF document text
    • https://cdn.sqhk.co/dodalowogiv/ijigVfX/wallpaper_gamer_4k_hd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413851/normal_601c0237c3fc9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vavijirodujozi.rf.gd/70144295431.pdfIn PDF document text
    • http://kokibitumoxa.epizy.com/cumulative_frequency_worksheet_ks3.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_off0000f7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E8 5284 bytes
SHA-256: 0c9cc0a9e7c17d7e14f3a37cd1c1ac4b96ee70b99566ee51eed4477b8702ec2a
font_01_sfnt_off000109d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D1 10228 bytes
SHA-256: b7c62d5796bee309dd42567ec32d31806de0ad227a35789a0ba074d38a625e28

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