Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e98f841d7ed0726…

MALICIOUS

PDF

72.6 KB Created: 2021-05-25 16:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: da54b3667cd5c2d00df64e57a7a658b9 SHA-1: 8cd063170fd03628502ea82224168ac16f331fff SHA-256: 6e98f841d7ed072673ceddaedc10bb61f776e613a91a68995b9fe50db41957d6
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to redirect users. The primary malicious URL identified is https://ponafet.ru/strik, which is likely used for phishing or to serve further malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/strik?utm_term=l%2527oeil+du+loup+questions+et+r%25C3%25A9ponses PDF link annotation
    • https://lodufowuk.weebly.com/uploads/1/3/4/5/134593986/xuvabovetafugivute.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418379/normal_606cc61221191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477163/normal_605f954c6d672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492580/normal_6035b39af2b8c.pdfIn PDF document text
    • https://rejowuboxobe.weebly.com/uploads/1/3/2/6/132680789/66b924ae9.pdfIn PDF document text
    • https://rajuvafawomok.weebly.com/uploads/1/3/4/4/134455823/vorad.pdfIn PDF document text
    • https://sitofozaliwi.weebly.com/uploads/1/3/4/3/134355749/7e383.pdfIn PDF document text
    • https://xawoveramexu.weebly.com/uploads/1/3/4/0/134095940/refalukab_nemalon_ziwavi_sodigazine.pdfIn PDF document text
    • https://kuwofepex.weebly.com/uploads/1/3/2/7/132740654/kunaxemosiriwevogife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498645/normal_605c5bf17c008.pdfIn PDF document text
    • https://metifavogogebo.weebly.com/uploads/1/3/4/7/134716609/bigolufez.pdfIn PDF document text
    • https://vawalebadafi.weebly.com/uploads/1/3/4/6/134660315/1521340.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385620/normal_605071d30ff7e.pdfIn PDF document text
    • https://xujuwoxevosu.weebly.com/uploads/1/3/4/8/134896670/lirageb-vogazawafodugog.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/984c99a9-225a-4ed0-ac38-44b90b8df771/42450835069.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/kisesunogexiwozosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2ee1cdf-fb98-4128-8d25-6df623dbc748/kufakamiluj.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/how_to_get_a_sword_style_in_anime_fighting_simulator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaec82c8-1c56-42b3-94e8-88989a4ffe4d/20524471333.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a58636e6-201e-4f86-bebd-bc3c9f53edde/supersonic_13.3_inch_tv_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/70886898842.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/72133688181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3f15e6f-0d7a-403a-ab28-2bdba2f25f6b/62895147392.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_off0000dc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC89 4988 bytes
SHA-256: 0bf3a66c2576e67503ddc4d4036b2e9c0efeb89e3f224f0bbd9e2f0711b60e00
font_01_sfnt_off0000ed4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 11576 bytes
SHA-256: a919e8f91571a0a4c6b0424d7557d06fa7d9d49a5e6559bcf705dd4ca54dbef0