Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4752bdf05aa2692…

MALICIOUS

PDF

74.8 KB Created: 2020-12-26 00:55:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b746f9c21608b96ff6e4a72f6716dc02 SHA-1: d394853540bd938aea0e04387f059559c08532f7 SHA-256: b4752bdf05aa26926f907f92508d61f32ef5ef763dcfa3281b1a84f562af5038
126 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML and ClamAV, indicating it is a phishing or trojan delivery mechanism. It functions as a link farm, directing users to external URLs such as 'https://trafficel.ru/strik?utm_term=rotator+cuff+tendonitis+exercises+nhs' under the guise of providing information on health exercises. The document's structure and numerous external links suggest an attempt to redirect users to potentially harmful content or further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://trafficel.ru/strik?utm_term=rotator+cuff+tendonitis+exercises+nhs PDF link annotation
    • https://rubuvewoxuvima.weebly.com/uploads/1/3/4/8/134873715/kumadizu_tabezox_bajorugazefat.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/8eb4ee8c.pdfIn PDF document text
    • https://kavaxaxogemiren.weebly.com/uploads/1/3/4/4/134441995/fodinudaxopana_tupibes_mawapewidafuvub.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/Fge6oVf/38637615484.pdfIn PDF document text
    • https://polabobaxadujo.weebly.com/uploads/1/3/4/7/134775235/piwamusavek-dosagiji-katak-kuziladoninopil.pdfIn PDF document text
    • https://gilolubirej.weebly.com/uploads/1/3/4/3/134309297/lazofufevos-xobeduvipa-zititinul-gesirilabem.pdfIn PDF document text
    • https://dajifavetesa.weebly.com/uploads/1/3/4/2/134234726/sozokuli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/cb1a6ffb-9fc0-431d-b755-3d336dd82d7e/97905343423.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/83393775996.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/abby_finereader_portable_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/sanctum_2_5_feats_of_strength_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7072d57-f762-4eba-9db2-0aa3e5c0cbd3/the_comet_web_dubois.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/86034059946.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_off0000dc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC00 5032 bytes
SHA-256: f3e8fa5dc904d70f3e36a4787f611a9de124d5382c9e4fc41e91200b36122dc7
font_01_sfnt_off0000ed1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1A 10292 bytes
SHA-256: c7f3ea1818c7b9503640519a4ea6504f975625d18a36c2bf651739427afde4c0
font_02_sfnt_off00011065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11065 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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