Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9f4211be063fbb…

MALICIOUS

PDF

81.3 KB Created: 2021-03-10 18:20:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d85f1fd43fc087f364534e9208b9692e SHA-1: 80204d127aa1f03e5c92e8cae2614824ceeabffe SHA-256: 1c9f4211be063fbbbc98b986cf994dd158507500ce74fb4dd9d1b25a66a94c13
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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=binomische+formel+englisch+%25C3%25BCbersetzung PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4500910/normal_5feba2aeb57b3.pdfIn PDF document text
    • https://cdn.sqhk.co/jomonufo/igikUXW/69356725589.pdfIn PDF document text
    • http://tetiviguxawik.getenjoyment.net/gelaboguwonibasadu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487201/normal_5fd31ca2a3630.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/dgjNFgd/draw_so_cute_mickey_mouse_ice_cream_cone.pdfIn PDF document text
    • https://cdn.sqhk.co/zetobazox/u9iajcZ/mufidubibimaja.pdfIn PDF document text
    • http://gadivawiw.sportsontheweb.net/50571376017.pdfIn PDF document text
    • https://duvozogol.weebly.com/uploads/1/3/5/3/135314926/bexojulorana.pdfIn PDF document text
    • http://bioforcecolumbia.site/mind_games_lyrics_woodieqt0wd.pdfIn PDF document text
    • http://trickyturkey.com/lucent_ecology_and_environment_book_in_hindipkbvr.pdfIn PDF document text
    • https://cdn.sqhk.co/favosejo/fE8CA75/digital_media_marketing_approach.pdfIn PDF document text
    • https://cdn.sqhk.co/nawakema/jggHjeS/23815111284.pdfIn PDF document text
    • http://sodalabs.pro/24114146521ajnzd.pdfIn PDF document text
    • https://cdn.sqhk.co/wopidevepip/jThfmWy/fitbit_charge_3_charger_same_as_charge_2.pdfIn PDF document text
    • https://wikoxunorature.weebly.com/uploads/1/3/5/9/135968981/molonetav-duvovutopalov.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwopaperuv/gjgjcge/racing_crazy_games_temple_run.pdfIn PDF document text
    • http://podcard2020.site/my_lg_front_load_washer_will_not_drainpz5jz.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
    • 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CC 5328 bytes
SHA-256: 5ad7066bdbbf262227d806073bed7a5aed19c5916f39df4a1f9a1625629a3dd2
font_01_sfnt_off0000e990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE990 12128 bytes
SHA-256: 6a30c0587159bd8d3053c8ba9e1762740af003a7f6f42206a7a5bf6fdff843fe
font_02_sfnt_off000111ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EC 16128 bytes
SHA-256: bfd634d3712c487d932e69a042cdf52523effffc397806a4650b0c914fa2b1d4
font_03_sfnt_off000126cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CB 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230