Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e7c82146e9e9963…

MALICIOUS

PDF

67.2 KB Created: 2021-04-03 19:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 500df007f1ece7f0dfd825d0bf8fd480 SHA-1: 731fbd29e97892b2967129d3d319e3668892a1fd SHA-256: 1e7c82146e9e99638ffb7278842790242197290408df2654afe0655bd627e5b3
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://vilenefex.ru/strik?utm_term=death+note+netflix+download PDF link annotation
    • http://dedekuwetom.iblogger.org/which_is_the_best_catholic_bible_version.pdfIn PDF document text
    • http://suvolupijiro.mygamesonline.org/simple_application_letter_format.pdfIn PDF document text
    • http://belldiscount.ru/where_do_most_of_your_calories_come_fromkgi2y.pdfIn PDF document text
    • http://arthromedshop.xyz/233872950030g5jk.pdfIn PDF document text
    • http://zegevuk.22web.org/garnier_charcoal_mask_sheet.pdfIn PDF document text
    • http://doroketosukuso.iblogger.org/76701486924.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mubefula/garujanubegedalaxop.pdfIn PDF document text
    • http://zowonotetejubi.rf.gd/nekobusuzusakexerakakaf.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/subadugimujibujaje.pdfIn PDF document text
    • http://fevifixe.epizy.com/gubepubomijekipeperaso.pdfIn PDF document text
    • http://nanesipub.rf.gd/12682425727.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1509e3e1-12ca-45df-8e5f-4495baa50c04/the_shock_doctrine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb384dd0-dad1-42e2-bfca-d6efa1983c9d/weber_genesis_ii_e-310_gbs_best_price.pdfIn PDF document text
    • http://budivisatenebo.rf.gd/51945672714.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_off0000ca00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA00 4880 bytes
SHA-256: 1be553326f113a3e637302c7592921834c6d0c9a0949c2f78f723de949c8c23d
font_01_sfnt_off0000dab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB4 11128 bytes
SHA-256: 3408732882c99791519071d57378c09ac550195f38f81fc89dc10abcc600946d