Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6c90e42db6287b…

MALICIOUS

PDF

74.8 KB Created: 2021-03-05 06:09:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 78745fa9b532d178f8642888284f171b SHA-1: b1342fc7361a4de3e827efab7545392523cb2c87 SHA-256: bb6c90e42db6287b98d9d330decce4f24cf580d1c7fc1b94d38f73f7611f6e0b
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure malicious intent. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were directly extracted, the structure and embedded URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

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://nipisod.ru/123?utm_term=panasonic+kx-tes824+software+and+driver+installation PDF link annotation
    • http://vorgazme.com/11996387049t3lfv.pdfIn PDF document text
    • http://wekeb.space/why_do_ships_use_knotsi57kv.pdfIn PDF document text
    • http://gakukuketisalum.scienceontheweb.net/76328997019.pdfIn PDF document text
    • http://arendagg.xyz/deraxusarijujelinigitamupfswv.pdfIn PDF document text
    • http://shimano-stradic.ru/energy_anti_stress_loops_mod_apk_downloadjwbpk.pdfIn PDF document text
    • https://zebazowis.weebly.com/uploads/1/3/4/3/134310266/nidojiga.pdfIn PDF document text
    • https://pagipakudux.weebly.com/uploads/1/3/5/3/135343553/nobajivakuxur.pdfIn PDF document text
    • http://didazema.mypressonline.com/hp_officejet_4500_scanner_driver_free_download.pdfIn PDF document text
    • http://all-gopro.com/5630681390530ft8.pdfIn PDF document text
    • https://relotevifinedu.weebly.com/uploads/1/3/2/6/132683264/xolajuvagemovu_denifomipamake_xujeseb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f1342b-af72-4953-87c2-e66e41d538c5/casio_exilim_ex-s100_bedienungsanleitung.pdfIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_cf0183b22e5d4acc90f42e86eb0d754e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec28c1bb-d4cd-41c0-9a37-310f53c50438/lochinvar_knight_boiler_service_due_reset.pdfIn PDF document text
    • https://ccd4a2e6-63e2-4dcb-a02e-1ae1253dabcc.filesusr.com/ugd/059ff1_af71eb96ded64f8d84326d2c204a2293.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f402394-9ab1-46b9-b96f-dd97a2820c1b/karusopojenobigosuri.pdfIn PDF document text
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_22adb29e3ba147388f74618e1c10c31e.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE493 5744 bytes
SHA-256: 9a9069c444463eb9b809a9a411739e510336b612a60b1f1aa5f8b5433c52eeee
font_01_sfnt_off0000f865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF865 11292 bytes
SHA-256: 4d8669786178bf2d0d8b56a034f9852aa2b7e64bc7c161d9949d30651ad578e7

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