Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f01acf10d7c51f8…

MALICIOUS

PDF

77.4 KB Created: 2021-04-02 12:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d7af04ba51ae1988580b4d366785413b SHA-1: b007e1c263b08ac9c9ab26e563b57b07c4f1e3b0 SHA-256: 5f01acf10d7c51f8e00f446c43395ffc8e311d0f1acaac9c441857cf326276a1
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to job interviews, a common phishing tactic.

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://soxebez.ru/strik?utm_term=security+officer+job+interview+questions+and+answers+pdf PDF link annotation
    • http://viziziziv.mywebcommunity.org/zomafijolumotonon.pdfIn PDF document text
    • http://on-arenas.com/how_do_you_make_beef_tartare_in_food_fantasytzndj.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://jezuvafu.weebly.com/uploads/1/3/5/3/135348480/1753500.pdfIn PDF document text
    • http://bluhgang.best/mevurukifevinaxixipibod0m8dq.pdfIn PDF document text
    • http://kurutog.mygamesonline.org/powimotikufumutavozevuta.pdfIn PDF document text
    • https://sexanugujox.weebly.com/uploads/1/3/4/2/134266496/tagujatep_jelikazozi_dokajorojopuro_fagojowozow.pdfIn PDF document text
    • http://suzupuwejal.mygamesonline.org/nedagurugutoxenumubumi.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/94243225097.pdfIn PDF document text
    • http://lumufurisazela.mywebcommunity.org/jasamafu.pdfIn PDF document text
    • http://businesshelpservice.com/what_is_the_significance_of_the_title_name_j_alfred_prufrock51da9.pdfIn PDF document text
    • https://nekusudowup.weebly.com/uploads/1/3/5/3/135315851/e30e3ab.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/7fe79102-3171-4911-b54d-6f98c744bec4/389983332.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/83897404539.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/when_do_stock_markets_open_around_the_world.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6647197c-91a3-441a-b7e3-9a0f6cb11d10/50354750344.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/panasonic_sd_2500_breadmaker_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f04b5cf1-29db-46db-9015-8755b4263c21/caloric_heritage_series_gas_stove_knobs.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/fozezumonaxufojadug.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_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 5816 bytes
SHA-256: d1cdd587991878cd15b3af41a59b5142d8b32b24b114d9dadb938726c2555178
font_01_sfnt_off000105f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F0 10052 bytes
SHA-256: 121229ff6ccf046e13d05d4f7f8e836467a3db45afb7bf77542d8dcec5a4646b

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