Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4704fa7446131d…

MALICIOUS

PDF

76.3 KB Created: 2021-06-13 00:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1564c02dc8b05e4b315588dc29401a94 SHA-1: 720df6c71ba4f02847a09f95ad2a8ccd4c947ddf SHA-256: 8b4704fa7446131d6ad801310b6094ff82e9697b4845bfeaabf6e76b8491fe0f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to direct users to external content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly indicate malicious intent. The embedded URLs are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://catamma.ru/pbw?utm_term=take+it+out+on+me+mp3+download
    • https://nunezexivu.weebly.com/uploads/1/3/4/4/134440215/8985191.pdf
    • https://sutisivanopazar.weebly.com/uploads/1/3/4/3/134310164/pudam.pdf
    • https://tuvukorop.weebly.com/uploads/1/3/1/8/131857527/rusaroxo.pdf
    • https://falototadapi.weebly.com/uploads/1/3/3/9/133989324/ropabebo.pdf
    • https://kotafogora.weebly.com/uploads/1/3/4/3/134322717/1016938.pdf
    • https://baresifesej.weebly.com/uploads/1/3/4/1/134131831/rafefigalanep_xokanusoseb_xarexufujon.pdf
    • https://zivadufo.weebly.com/uploads/1/3/0/8/130874541/wobevonegol.pdf
    • https://kimonasisu.weebly.com/uploads/1/3/5/4/135400987/jejexiv_sujizanuli_mizoxota.pdf
    • https://vipapixamez.weebly.com/uploads/1/3/0/8/130814430/bevekuzi.pdf
    • https://bofanowowedo.weebly.com/uploads/1/3/4/5/134506880/8005e9.pdf
    • https://ruxosegid.weebly.com/uploads/1/3/4/2/134265817/6ac2f6270d.pdf
    • https://dorugemapakew.weebly.com/uploads/1/3/4/6/134680888/vuzitelasa.pdf
    • https://jupufafel.weebly.com/uploads/1/3/2/7/132740723/jokoxudejurotipemux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gisugakeg.pbworks.com/w/file/fetch/144651549/78579377016.pdf
    • https://uploads.strikinglycdn.com/files/f0be806e-967d-4be7-9b99-9d37549f683b/cyberpowerpc_cpu_fan_not_working.pdf
    • http://tujelupirobe.pbworks.com/w/file/fetch/144520392/breviarium_romanum_1962.pdf
    • http://togusan.pbworks.com/f/sonic_the_hedgehog_2_xl_unblocked.pdf
    • https://uploads.strikinglycdn.com/files/0ec76f18-9b2a-46b4-a4eb-7df8ecb5a1c6/50129767259.pdf
    • https://uploads.strikinglycdn.com/files/eb8c79fc-e1b4-4351-8e4f-1adc38e19720/zettili_solution_manual_download.pdf
    • https://uploads.strikinglycdn.com/files/dd1a4a52-0c18-4cb3-907d-7c6c9b56d9c7/reading_comprehension_questions_and_answers_for_grade_12.pdf
    • https://uploads.strikinglycdn.com/files/45d5e107-0aac-4276-835c-07276ada4682/netgear_router_wnr3500lv2_firmware_update.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee6b.bin
dd130df753c5e1533f82174f70eafc25caf0656c6151969fea5fa55440b0e642		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6B 5100 bytes
font_01_sfnt_off0000ffd1.bin
b6ac4d89e5124b530ae6b23053157cf1776242453fe817020a81ee8f4b3cba17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD1 10480 bytes

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