Malicious PDF — malware analysis report

Static analysis result for SHA-256 d165bec5eb6d92a5…

MALICIOUS

PDF

70.6 KB Created: 2021-03-02 01:41:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 50a7ab86d8ff023033038d272330e11a SHA-1: 9fd04f8f11897a8c5a93e6744b61f99f648584f9 SHA-256: d165bec5eb6d92a5e385ed343f2bbdc05be4b625bb2456a4a0806c26e2d4de17
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate setup for distributing multiple potentially harmful files.

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=professor+messer+network%252B+notes+pdf+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475571/normal_5ff8ae38a2d16.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/ahj6VUa/vmod_2_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416131/normal_60122ee5b08ed.pdfIn PDF document text
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/nibinem.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/Q6G9jg6/72401_weather_forecast.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/he0ibia/8006461087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381340/normal_5fe81e1e350f2.pdfIn PDF document text
    • http://xazoxewimimo.iblogger.org/boxidamipujoxezevolafut.pdfIn PDF document text
    • https://lupolaluxu.weebly.com/uploads/1/3/2/6/132681144/biwabebepi-nakos-sejanutomoga-mufuwakow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453332/normal_602b9397d9ca4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494138/normal_5fcf06bee1532.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/eZnhFOS/resorukovugazulovuzivovef.pdfIn PDF document text
    • https://sefokuto.weebly.com/uploads/1/3/0/7/130738721/wunageso_timunugeguxexe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naximeb.rf.gd/reflexive_pronouns_worksheets_for_grade_4.pdfIn PDF document text
    • http://xuvotawelotito.epizy.com/tuzegavosifo.pdfIn PDF document text
    • http://lerofisa.epizy.com/chicken_soup_for_the_soul_story_guidelines.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_off0000d864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD864 5104 bytes
SHA-256: 851c5bd51224bfc2635e9a55183c416a8dde7b0109c476451224981928f0afa3
font_01_sfnt_off0000e9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C6 10420 bytes
SHA-256: 07cfc21e65be60a00f508478e72fd5a8b80e70c4dbb36a4d164e391b6985358c

Open this report in the interactive analyzer, or submit your own file for analysis.