Malicious PDF — malware analysis report

Static analysis result for SHA-256 957920119216e815…

MALICIOUS

PDF

69.9 KB Created: 2021-03-09 18:53:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 548fbab99687a1a448ee247fbefa8692 SHA-1: b347b931d66d4725a034ba75e91b7a343a98d589 SHA-256: 957920119216e8150dc7889d706ae8e7378eec394b74d578cf823a0e2c636d07
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, disguised as a crossword puzzle answer key. This lure is designed to trick users into visiting the external site, which is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness.

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://gimoguvi.ru/wix?keyword=the+middle+ages+medieval+crossword+puzzle+answers PDF link annotation
    • https://pimuvetu.weebly.com/uploads/1/3/4/6/134635596/3c4b081fd3b.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/what_setting_should_i_use_on_my_scotts_fertilizer_spreader.pdfIn PDF document text
    • http://dozawudefe.iblogger.org/23887912466.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378853/normal_5fd5fddc29e59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379626/normal_5ff0602476e02.pdfIn PDF document text
    • http://suberubepuparo.getenjoyment.net/how_to_make_money_reading_tarot.pdfIn PDF document text
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/robafo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475571/normal_602317897c257.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484154/normal_5fe5c5519887e.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
    • https://s3.amazonaws.com/nerugiraxura/steps_in_data_analysis_quantitative_research.pdfIn PDF document text
    • http://rotufixijisadi.onlinewebshop.net/selections_from_the_complete_works_of_swami_vivekananda.pdfIn PDF document text
    • http://foboganezebalo.rf.gd/motorola_cp200d_earbud.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/wenosevaguvobabimi.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/aspiracion_de_secreciones_en_el_recien_nacido.pdfIn PDF document text
    • http://zobibeki.rf.gd/sokilitowinaxesirajelil.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/49035662166.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/dudafezep.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87F 5440 bytes
SHA-256: a76bacbf1d954a33f71bd32a8587beaab1c5c9601776e3f2d61b20b9a0c689ec
font_01_sfnt_off0000dae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 9692 bytes
SHA-256: 8be732bfb98de9168a89abad38ffa073b4d2d352550122c62591f6c95c51c954
font_02_sfnt_off0000fc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC06 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176