Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a577e2cf6db6ceb…

MALICIOUS

PDF

93.0 KB Created: 2021-04-04 17:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c1693c231adb4ad8ea5c2ed59c91f477 SHA-1: daf1e50760345e630844919f7bb8357b09027881 SHA-256: 2a577e2cf6db6ceb0c41028052a3227dcb381c7cc68813d8864986aab0da611b
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 0.9989

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://jottigo.ru/strik?utm_term=how+to+use+fl+studio+20+in+hindi PDF link annotation
    • http://matcobzor.ru/christmas_carols__youtube__classicrghkp.pdfIn PDF document text
    • https://cdn.sqhk.co/bikakigiben/ihigILW/zizerodewegifujewalis.pdfIn PDF document text
    • http://termo-nord.tech/ping_pong_tutorialrvfvi.pdfIn PDF document text
    • http://center-san.ru/761403985414opby.pdfIn PDF document text
    • https://cdn.sqhk.co/milatepoz/gh2VhdB/89572338458.pdfIn PDF document text
    • https://zufugorutamivas.weebly.com/uploads/1/3/4/4/134401118/7749068.pdfIn PDF document text
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/1a603f3de0781.pdfIn PDF document text
    • https://lifalaril.weebly.com/uploads/1/3/4/8/134883644/1ac89af9f.pdfIn PDF document text
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/xedawefo.pdfIn PDF document text
    • https://cdn.sqhk.co/moradivovep/b7F9hia/61236517876.pdfIn PDF document text
    • http://lidlid.xyz/6901233017768jdb.pdfIn PDF document text
    • http://natur-green.fun/tableaux_de_provence_alto_saxljqfp.pdfIn PDF document text
    • http://electorat.org/tunaregipafuzolureleze1b4e4.pdfIn PDF document text
    • http://tublitalia.space/how_to_beat_black_ice_frostbear_fnaf_arge4te.pdfIn PDF document text
    • http://timelessdecorum.com/objective_soil_science_by_rameshjqkci.pdfIn PDF document text
    • https://dizegeduwawab.weebly.com/uploads/1/3/4/3/134374994/biginetalami_dewazuxo.pdfIn PDF document text
    • https://cdn.sqhk.co/luwibajik/jf9vMMx/pimiribuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_bc8b45e45bf548858390de042950da07.pdf?index=trueIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_eaace0257e434e8ab7a60c5be0407b31.pdf?index=trueIn PDF document text
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_f9cf50e18dd448d6924230378e8aaefd.pdf?index=trueIn PDF document text
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_af5f06a3b8ae477f9f8213e75dbcbe6b.pdf?index=trueIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_e15c53c3e3a944d0afaca9283d9f923d.pdf?index=trueIn PDF document text
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_9caa9e519e5b4e2088322967dd78abc7.pdf?index=trueIn PDF document text
    • https://f78a7b13-e75c-4ddc-9f3c-03cd83736f6c.filesusr.com/ugd/90c53f_b909682373f74e0ebe1a5e8a658bd7d2.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_off00010964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10964 5016 bytes
SHA-256: 623483119b026e9e969179409ad523e3a38d02fdeef8aa2f26f21beb2b8d9a8b
font_01_sfnt_off00011a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A89 10312 bytes
SHA-256: 811bdc1dd7f2f96d1a398231d5bf7ef04718d013291cc0945df5ad67de22ff5d
font_02_sfnt_off00013e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E35 12364 bytes
SHA-256: a0dd23895d52a9d843ec83f6001734ab7adbaaffe9e16e0afd16089f9310eb4d