Malicious PDF — malware analysis report

Static analysis result for SHA-256 35bfdbe3ee598f26…

MALICIOUS

PDF

82.6 KB Created: 2021-03-15 12:28:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9f33355e83c7ac0ffa869e20d361c689 SHA-1: 82f2e713fd71778737fee0a3858648e4a9e81f40 SHA-256: 35bfdbe3ee598f26390622c790fd61572b14a5546bf88bde4399e92f325b0ca9
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting and link farms, indicating an attempt to redirect users to malicious sites. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution campaign.

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://zajinet.ru/strik?utm_term=apollo+twin+duo+usb+vs+mkii PDF link annotation
    • https://ribofefafuf.weebly.com/uploads/1/3/4/7/134770843/patexutefener_zisuvub_kerijutupob_rabutolutuli.pdfIn PDF document text
    • http://teleporttur.ru/34440816065zunr5.pdfIn PDF document text
    • https://najatiruz.weebly.com/uploads/1/3/0/7/130738831/zuvirogusuduwu.pdfIn PDF document text
    • https://lopiranurepo.weebly.com/uploads/1/3/4/7/134735856/1537323.pdfIn PDF document text
    • https://vifejekim.weebly.com/uploads/1/3/5/3/135322606/7020827.pdfIn PDF document text
    • http://kekewawoxugar.sportsontheweb.net/xopajenorovevisutin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403816/normal_5ffebed7adbc5.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/cetoacidosis_diabetica_pediatria_2020.pdfIn PDF document text
    • http://on24-system.club/graphing_quadratic_functions_using_tables_worksheets3eix.pdfIn PDF document text
    • http://remoliwagofaju.mywebcommunity.org/jasovivasiwan.pdfIn PDF document text
    • http://rivivivojizejit.22web.org/mri_guided_core_biopsy_cpt_code.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411917/normal_6048713d483fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369907/normal_60029b6cc70f6.pdfIn PDF document text
    • http://mmuuue.space/fikivokexabury2fp1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/64b1bde3-c6ce-418e-8543-04ee0fd58855/a_200-n_force_is_applied_as_shown_to_the_bracket_abc._determine_the_moment_of_the_force_about_a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cbe54ef-b68e-4ab6-b847-1326b8e0a109/yamaha_av_receiver_model_rx-v671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4e797de-34d2-4b3f-9d3d-e58836de2268/gatifizusoje.pdfIn PDF document text
    • http://sijurajogo.epizy.com/gagupukoduvuwo.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_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 5144 bytes
SHA-256: 2d2c6595239f848d324dd700af6e093705013cb4b98816e67d0959e68e2430f7
font_01_sfnt_off000104af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AF 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00010d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3D 20864 bytes
SHA-256: bd5ad7c40a13ca93d30cd5ea52fedb66ccd055a75ffd9dda2bf15ea7d92e00bd

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