Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f942d7283711ece…

MALICIOUS

PDF

84.0 KB Created: 2021-04-24 14:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d31940b9e3441db7729172a413250dc3 SHA-1: ebd3535e7e2895d518edb3a13ff81a004a7e6ce5 SHA-256: 5f942d7283711eced5cc520718d50235d359ad2e8db8a7f1a7dde2589ac46472
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or spam campaign. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to drive traffic or host malicious content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the primary external link points to a URL that includes a search query related to the industrial revolution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/strik?utm_term=what+are+the+reasons+for+industrial+revolution PDF link annotation
    • http://forpost-electrica.ru/xfinity_stream_beta_app_on_roku_reviewskooi.pdfIn PDF document text
    • http://vivodomox.22web.org/wedding_march_lohengrin.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/f9iiHjh/classic_scary_movies_2000s.pdfIn PDF document text
    • http://ihsteam.ru/lee_child_jack_reacher_books_in_date_order6rt07.pdfIn PDF document text
    • http://help-bluebadgecenter.com/bernard_cornwell_13567y9f1.pdfIn PDF document text
    • https://cdn.sqhk.co/kagixepo/tjgijjb/zixujofiwetupimukixi.pdfIn PDF document text
    • http://simcars.ru/941517155597l5l.pdfIn PDF document text
    • http://pitushok.fun/sifuliluzawuzu4myk3.pdfIn PDF document text
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/8279515.pdfIn PDF document text
    • https://wizitizisib.weebly.com/uploads/1/3/4/3/134361222/7b372715fd.pdfIn PDF document text
    • https://todilotifobaw.weebly.com/uploads/1/3/2/7/132712516/menex.pdfIn PDF document text
    • https://pizavanaxuvilu.weebly.com/uploads/1/3/5/3/135386491/jixadigibilobu.pdfIn PDF document text
    • https://cdn.sqhk.co/dafiwexoki/wHieiit/80419433567.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_f88bfa5b6bea4e27a2a9b451e6929ac4.pdf?index=trueIn PDF document text
    • https://190d602c-e74a-4ea1-b1d2-d722d7947d0f.filesusr.com/ugd/1eddd4_a12427903db946818e543d2f5d96d4d8.pdf?index=trueIn PDF document text
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_6a12f2ec8f854ef8bfb1100b47a4ea9a.pdf?index=trueIn PDF document text
    • http://xidafod.rf.gd/printable_2020_monthly_calendar.pdfIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_995c2dde8c0e4f348859ed18c22ba135.pdf?index=trueIn PDF document text
    • https://5a2ada08-5b6c-402a-b0df-3636415b461e.filesusr.com/ugd/434ae6_bf49b3891e0a4b4690db04404db27f26.pdf?index=trueIn PDF document text
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_1ca2c04571b34dfba6671e3c439b44d2.pdf?index=trueIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_2c142f3a55d64203825c01d5543346cb.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_off0000fe7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7E 4948 bytes
SHA-256: 1b35c47ede9859ca2248f0668e2715b9a627d6b2acee582884b70c9d4a35a29c
font_01_sfnt_off00010f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F58 10680 bytes
SHA-256: b90d980a8aaa0e35c6e569b9ff686b2f8d85d387448497b42718acf4e4bd850f
font_02_sfnt_off000133ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AD 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361