Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f6fa247b9b09d3…

MALICIOUS

PDF

73.7 KB Created: 2021-02-25 13:57:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a4e2a02094737af1ced143301f394a36 SHA-1: 21c2060a71c01dc9fc3dc8f7095483551924ab92 SHA-256: 87f6fa247b9b09d3ed0402946a98fe1457a0a59f8d1ee2634dd93eb2807e7a2d
134 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to disposable hosting, and one URL is presented as a download for a 'rc_helicopter_simulator_free_download_pc.pdf'. The document body contains metadata related to its creation by wkhtmltopdf, suggesting it was generated programmatically rather than being a typical user-created document.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=fundamentals+of+momentum+heat+and+mass+transfer+5th+edition+solutions PDF link annotation
    • https://cdn.sqhk.co/sobupepokor/v3Bjeii/rc_helicopter_simulator_free_download_pc.pdfIn PDF document text
    • http://retamos.mygamesonline.org/trombone_position_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/fejisedetu/fhdjbgj/vavemezizo.pdfIn PDF document text
    • https://cdn.sqhk.co/lepemafe/gfRghsS/mosinetavevo.pdfIn PDF document text
    • http://canonsburglake.org/homeschooling_in_california_for_kindergarten08xoo.pdfIn PDF document text
    • https://cdn.sqhk.co/sazobenapur/d2iihec/85968273735.pdfIn PDF document text
    • http://tamakar.xyz/american_racing_wheels_and_tires_packages50ebc.pdfIn PDF document text
    • http://goodsun.space/dularunavulubixfh0w.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/YlSS5jh/flat_pack_desk_design.pdfIn PDF document text
    • http://punavuvipufov.sportsontheweb.net/collagen_improve_skin_tone.pdfIn PDF document text
    • https://cdn.sqhk.co/jalosemuv/40KlrpZ/debujadadixusesoluv.pdfIn PDF document text
    • https://cdn.sqhk.co/fofasafiwi/rAIjagh/65040893612.pdfIn PDF document text
    • https://cdn.sqhk.co/jizesusaxeta/RggXibs/child_care_near_me_now.pdfIn PDF document text
    • http://afracheat2.xyz/jenufemeloredofepadi9f49i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zudupaxub.myartsonline.com/18111867184.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/vigavawabogusujojuxe.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/avengers_endgame_blu_ray_digital.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/30171502554.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/physical_asset_management_book.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_off0000e24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24A 5224 bytes
SHA-256: c63ac964d3213dcc02a820d66613febbe53fb4e67a0f37ffb98d10f45b689990
font_01_sfnt_off0000f3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E9 10820 bytes
SHA-256: 88cf5a047c477428bb5eb56328025f04cf1becc3f5eea8093c5aa591db30f393

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