Malicious PDF — malware analysis report

Static analysis result for SHA-256 217389dc99ab956f…

MALICIOUS

PDF

82.5 KB Created: 2021-03-22 18:43:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: da12958446980ecf4e37dddddad06777 SHA-1: b277b512c85a4c9a04137fe57e7775a43a502084 SHA-256: 217389dc99ab956fbebd1fb100c5a01aa4b94eca784d3d5f097a3f86bc663c88
186 Risk Score

Malware Insights

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

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 0.9990

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://druttle.ru/strik?utm_term=killing+floor+2+gameplay+ps4 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4474759/normal_600655142af44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453560/normal_6035d91eddceb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449998/normal_604e79d2daee5.pdfIn PDF document text
    • http://bu-markett.com/five_night_at_freddy_4_apk_free_downloadzs820.pdfIn PDF document text
    • https://vafiradas.weebly.com/uploads/1/3/3/9/133988778/1300879.pdfIn PDF document text
    • http://sweetmeet.online/how_does_scuba_breathing_apparatus_workodjrm.pdfIn PDF document text
    • https://jalamipitifem.weebly.com/uploads/1/3/0/7/130738892/816235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413713/normal_6043ec476577e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496381/normal_60079a3dd053a.pdfIn PDF document text
    • http://hhizmet.com/fruit_clinic_game_free_online77wsq.pdfIn PDF document text
    • http://vosalax.22web.org/loi_binomiale_terminale_s_formule.pdfIn PDF document text
    • https://bawilawuvibowe.weebly.com/uploads/1/3/4/4/134401702/jeneti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428083/normal_6036fe2272df1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485435/normal_601cd92c6e7ac.pdfIn PDF document text
    • http://terubib.22web.org/brusters_online_application_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449177/normal_60579d28382df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412902/normal_605350c4a29ec.pdfIn PDF document text
    • https://vematonejos.weebly.com/uploads/1/3/1/3/131383464/vinetafumonazote.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://temekerujaniva.rf.gd/lonimoxusaxakaxi.pdfIn PDF document text
    • http://tafobinememen.epizy.com/nikon_d5600_user_guide.pdfIn PDF document text
    • http://xajojunedaxuda.epizy.com/attack_on_titan_full_movie_part_2_end_of_the_world.pdfIn PDF document text
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_fcde16b31ac743cf8ce5a979148e692e.pdf?index=trueIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_aff1126b3fee4954840c07581fe4f9bf.pdf?index=trueIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_786155646583442c87ca8810f4a2d065.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FA 3836 bytes
SHA-256: 8f6558a152276674689c4f95da50c791e339046d6742a215c81905b7c7ef1441
font_01_sfnt_off0001019c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019C 5512 bytes
SHA-256: d7e7397d93942fce5ebfaa5dea17b2d989bf391d2b2626c5ba261d66b70a1d6f
font_02_sfnt_off00011466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11466 11732 bytes
SHA-256: 8ffa674cb8eecb7dd0b1b59764614ce0e496ddab8bf942844ab5a95e72dadffe