Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f0ed47535ad40cf…

MALICIOUS

PDF

81.1 KB Created: 2021-02-22 23:15:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a11f220653b035bb5146dcabf0f0401e SHA-1: e50053ba0b31a1ad1e6178b06a986016ecede8cd SHA-256: 7f0ed47535ad40cfbebd21497e3604b3937a953f053d790b7d44658720ed6030
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://seumenha.ru/strik?utm_term=como+crear+un+archivo+en+linux+centos PDF link annotation
    • https://kuzuvofaneze.weebly.com/uploads/1/3/5/3/135394893/dezanedula.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384154/normal_5fed68208795f.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzixapudel/jlsicia/gopunedije.pdfIn PDF document text
    • https://kuzeloxowew.weebly.com/uploads/1/3/4/3/134330257/d4d904979.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/jcijib4/20229066632.pdfIn PDF document text
    • http://flowerport.shop/hp_officejet_7310_ink33vnp.pdfIn PDF document text
    • http://life50it.pro/application_form_korean_embassy5swz6.pdfIn PDF document text
    • http://idslim-italia.site/20021547249l92rj.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/jjgc1gj/41797277441.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494147/normal_6009ecf7e1f95.pdfIn PDF document text
    • http://shlifovka-pol.website/play_of_consciousness_by_swami_muktanandaqqs3m.pdfIn PDF document text
    • https://bomoturu.weebly.com/uploads/1/3/1/3/131384468/numigirejorod.pdfIn PDF document text
    • https://xevowuzari.weebly.com/uploads/1/3/1/4/131437308/e3655.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pukadevimetuz.rf.gd/ccs_ba_date_sheet_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/american_english_file_3_third_edition.pdfIn PDF document text
    • http://juwelaloz.epizy.com/math_worksheets_grade_6_long_division.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D6 5072 bytes
SHA-256: 9f8dcb591bec14811016138661566ff597b938719f0abe25da50e43ea7b71d0b
font_01_sfnt_off0000f9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9ED 11584 bytes
SHA-256: 100324dd90643d98aeba35525d91b2bddf583a9f4a969d32c2246d27fe0b533c
font_02_sfnt_off00012012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12012 16088 bytes
SHA-256: b2ddecaff7e2361bf51021b35f9c014659943b600c4f466cb4656cea9e83b80e