Malicious PDF — malware analysis report

Static analysis result for SHA-256 97402c089a95fb0c…

MALICIOUS

PDF

77.6 KB Created: 2021-04-04 18:39:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5924830c24a956d14cf0534c9c26cecc SHA-1: 55d843ce6ef6f6030946a11dc71fc5faf0d1c024 SHA-256: 97402c089a95fb0c4a6765e9c147035931f0b541ad7d917aef8e43364919766a
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 0.9992

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://crophysi.ru/wix?keyword=mercury+outboard+service+manuals+free PDF link annotation
    • http://biolinkus.me/sekigirujufodugq9y7d.pdfIn PDF document text
    • http://musc-media.xyz/848797009869pbqs.pdfIn PDF document text
    • http://eurozone.pro/rutoxlo3ya.pdfIn PDF document text
    • https://vixadabunukup.weebly.com/uploads/1/3/4/9/134902839/2041732.pdfIn PDF document text
    • http://idealica-official.website/us_history_timeline_from_1600_to_18007ohcb.pdfIn PDF document text
    • https://midumusifefo.weebly.com/uploads/1/3/5/4/135401272/5951395.pdfIn PDF document text
    • http://getplafond.xyz/autoplay_menu_builder_7._1_freee2jju.pdfIn PDF document text
    • http://dwatches.site/how_do_i_change_my_honeywell_air_filteru2ppz.pdfIn PDF document text
    • https://rogefuza.weebly.com/uploads/1/3/4/6/134688393/lupozoruxefefejuza.pdfIn PDF document text
    • https://rewusimivizegan.weebly.com/uploads/1/3/4/5/134578415/fabofufubuwe.pdfIn PDF document text
    • https://vekoduxiboba.weebly.com/uploads/1/3/1/3/131398498/8749389.pdfIn PDF document text
    • http://tublitalia.fun/119379425873i0n1.pdfIn PDF document text
    • http://sluzhba1.net/75916605459hk0zu.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/144cbb4c-59b4-4699-8edc-028f534b5df4/pidoxinepuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8dc0a4b-7f7f-4abe-949b-15dbfc9b2778/97725563402.pdfIn PDF document text
    • https://6346cca1-8be9-442e-91e0-e35201572fa6.filesusr.com/ugd/a8c077_13ddda8cbcbd448fba6ac1417c8dc06e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf59b014-1293-40e7-8c9a-3ee6b4c8d720/90955148071.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69533742-f0a1-4629-a954-d539248128b3/91343196486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb9428b4-54d4-497a-80b8-06fbcbb5a145/how_to_put_a_bobbin_in_a_singer_sewing_machine.pdfIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_e91ab849ad894561872652d6d7e63859.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae71d5bc-183f-4857-9c3d-adcb2d8f5d4e/refamolazapenatiposugetol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b920a860-ea70-4052-9a04-d56aed158a6c/9200444631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab1103e6-48da-48af-a4bd-4a5f6aa8412e/commas_worksheet.pdfIn 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_off0000ef78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF78 5472 bytes
SHA-256: e982c4fad4a63f662281b8e48c17c1a31d742930cf9181897ea4f0773d50b61e
font_01_sfnt_off00010219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10219 11252 bytes
SHA-256: 82d64131b47eaaf77614b6067e9b1d46e6036e95cdf416b4c43a92a387ff0b72