Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5c6af95bdc86a3…

MALICIOUS

PDF

96.8 KB Created: 2021-04-02 12:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 675551a8029cbdbf3b5b031812415136 SHA-1: b124da5f09ce072ca1e89d0ca9bc7b677c0be162 SHA-256: 7e5c6af95bdc86a3810f9f5bd80cf426384be4abfdac281f8bc67c0155ca7bc1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links to disposable domains, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or to distribute further malware. While no scripts were directly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://gimoguvi.ru/strik?utm_term=how+many+numbers+are+in+your+driver%2527s+license PDF link annotation
    • http://vixegoxufareka.getenjoyment.net/dipedug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450507/normal_601afebfb1ab3.pdfIn PDF document text
    • http://musumavugas.iblogger.org/carte_du_monde_a4.pdfIn PDF document text
    • http://instapodarok.site/30.17qm3w.pdfIn PDF document text
    • http://roflan.site/voralgo7kq.pdfIn PDF document text
    • https://kolofajek.weebly.com/uploads/1/3/0/9/130969684/0d5dde5703924a.pdfIn PDF document text
    • https://wowobomufib.weebly.com/uploads/1/3/0/8/130874304/1975557.pdfIn PDF document text
    • https://tunoritusaw.weebly.com/uploads/1/3/5/3/135328070/5685601.pdfIn PDF document text
    • http://eferevole.com/how_to_reset_bowflex_max_trainer_m33thnl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446761/normal_60119b035ab91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414161/normal_5fdc38456d406.pdfIn PDF document text
    • http://twoup-viktoria.online/shell_script_command_line_arguments_check0mw6v.pdfIn PDF document text
    • http://chestlune.online/745828869222ezj2.pdfIn PDF document text
    • https://gawujura.weebly.com/uploads/1/3/5/3/135325150/9227903.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480880/normal_6023cd5e453dd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_52ce6bde5b2c405b99c836276f6fa44e.pdf?index=trueIn PDF document text
    • http://xovolefewawex.atwebpages.com/white_christmas_song_snow.pdfIn PDF document text
    • https://507f79ed-2408-4027-b124-45ed49bded7d.filesusr.com/ugd/2de61b_81ea9e19e46b46a7b56fdc11be265f66.pdf?index=trueIn PDF document text
    • http://vomovawesojuti.epizy.com/99707932363.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_off00013610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13610 5476 bytes
SHA-256: 96ae2c1ec1af6a8d1a30609832f4437a7137637dbde6052e5d815c40e2f1cf51
font_01_sfnt_off000148b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B0 13012 bytes
SHA-256: c888ed3e4ef5846342959b94cdcd9be13e5fa65ba85b0fe06b95dffaf2dfdfa9

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