Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83349dadcc2539f…

MALICIOUS

PDF

78.3 KB Created: 2021-03-02 07:15:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b496c578f241426ce550897812285a31 SHA-1: 30c531d48ac33f5cd523a5ea5f3e21ad063070e3 SHA-256: a83349dadcc2539fce5913b11cfdd5befb6d7360757921f04d45f4d4ffe94522
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to disposable domains and are likely part of a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary lure appears to be related to "grasshopper anatomy labeled", directing users to a suspicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://baarspo.ru/wix?keyword=grasshopper+anatomy+labeled PDF link annotation
    • http://characduwe.space/mircea_eliade_le_chamanismekmz5j.pdfIn PDF document text
    • http://grantmedica.ru/choices_free_diamonds_androidphrnw.pdfIn PDF document text
    • http://garant-ritual.online/cisco_asdm_manualdc8la.pdfIn PDF document text
    • http://registrat.space/95657291861xdd8p.pdfIn PDF document text
    • https://wexarasi.weebly.com/uploads/1/3/4/3/134351888/mefijatosodaxoveme.pdfIn PDF document text
    • http://jidapuxedepu.medianewsonline.com/how_to_hook_up_bose_cinemate_series_ii_to_tv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367940/normal_5fdae0fcc62d3.pdfIn PDF document text
    • https://xaweworamek.weebly.com/uploads/1/3/4/6/134610398/1399715.pdfIn PDF document text
    • https://gedofulijul.weebly.com/uploads/1/3/0/7/130775434/wafumelizexawipezet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369768/normal_601e59ffb9c4a.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/jirotekerorowatuzideb.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/dojirivovomugobikimobin.pdfIn PDF document text
    • http://prodive.su/bangla_movie_shakib_khan_videogt9y7.pdfIn PDF document text
    • http://plsale.pro/9_months_before_october_24_2006aw1sy.pdfIn PDF document text
    • http://vojemodipu.sportsontheweb.net/wepidodosazavogozapure.pdfIn PDF document text
    • https://sepuzudagek.weebly.com/uploads/1/3/5/3/135329554/8da8322dcdb0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xalasawu/88371925055.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_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 5472 bytes
SHA-256: 144e1b93d9857f53da4f1af2d16010b58fbfc32a8536b80fe5f1df96cdd55c61
font_01_sfnt_off00010800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10800 10196 bytes
SHA-256: e817e93b6a3c1a763d982f630caf37b1accc03d8842038ae3af0fd704fc7a7a4

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