Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b06af1c9474a13…

MALICIOUS

PDF

74.3 KB Created: 2021-03-11 19:27:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b92379ab43cedca1877078ea885c950b SHA-1: b8773d7dc675f023c893d2d99e9350a326c68f54 SHA-256: a5b06af1c9474a13d166cf75c1e8ff5ba2dc4f325d04a3e8b4b9023bc658a00f
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URIs indicate an attempt to redirect the user to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/award?keyword=filehippo+pdf+to+jpg PDF link annotation
    • https://cdn.sqhk.co/koxajavu/ahbgiZr/age_of_thrones_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/heihjd0/pajupojopuge.pdfIn PDF document text
    • http://choosemadam.site/wikobimosagixojinitipevvxbo6.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/ahaidS8/vulimirite.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/autobiography_of_red_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/Dlhbavn/eartha_kitt_i_want_to_be_evil.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/6LCihjc/myrkur_folkesange_lyrics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460042/normal_6021282629084.pdfIn PDF document text
    • https://cdn.sqhk.co/fejisedetu/jaegcrz/xepabowibakuzoxesefoxar.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuwutitaw/eiijfhf/carpet_cleaning_solution_auto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391623/normal_5fef978890afd.pdfIn PDF document text
    • https://cdn.sqhk.co/zisujidixa/sjbjc5Q/siren_head_sound_id_code.pdfIn PDF document text
    • http://wowitaly.space/research_grant_proposal_example4d5oq.pdfIn PDF document text
    • https://cdn.sqhk.co/wofazexej/jiajbie/40925410247.pdfIn PDF document text
    • https://cdn.sqhk.co/tokejosanawo/hdOblhg/jhansi_cantonment_board_admit_card.pdfIn PDF document text
    • https://cdn.sqhk.co/wavefekus/fghjeva/16461542854.pdfIn PDF document text
    • https://cdn.sqhk.co/sosexazefip/hhdoicV/69096526970.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lugenizuridaj.atwebpages.com/mofilefutodik.pdfIn PDF document text
    • http://rorokepu.atwebpages.com/jaketijavamixaniju.pdfIn PDF document text
    • http://rizivubonulej.atwebpages.com/lolaga.pdfIn PDF document text
    • http://xonolori.atwebpages.com/andreas_moritz_libros_gratis.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_off0000e816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 4848 bytes
SHA-256: 7dfcf4001133d4343f76df3e2ddb6ef70583cbaff747d2de81361a88c27e21d7
font_01_sfnt_off0000f8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 10392 bytes
SHA-256: d39167f15cafcc46ee05915d76d0a2f49cce6400dfad1ba20901e03b40e3838c

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