Malicious PDF — malware analysis report

Static analysis result for SHA-256 0834113869eff519…

MALICIOUS

PDF

77.6 KB Created: 2021-03-12 09:22:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 03651e540017b57f3ba59cbf92773134 SHA-1: d82c048d0965a0bdbbfa05c432fc960fc6716eb7 SHA-256: 0834113869eff5199a821689e98e4896b72c273f5cf67a7f72b0e43e1443a375
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, with several pointing to disposable hosting or unknown reputation domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a network of potentially malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/award?keyword=amls+buch+pdf PDF link annotation
    • http://lufusozajufa.22web.org/botet.pdfIn PDF document text
    • http://vehicleinsusa.com/vemelewokezupali91g7.pdfIn PDF document text
    • http://dalosizofovabes.medianewsonline.com/how_to_live_365_days_a_year_drive.pdfIn PDF document text
    • http://gelufose.scienceontheweb.net/42395957170.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389354/normal_60103cb650204.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493602/normal_5ffe44713aa26.pdfIn PDF document text
    • http://vkysnaya-eda.site/bajamavufemadujonmczp0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_603e9ef5538c8.pdfIn PDF document text
    • http://xidufefonudug.sportsontheweb.net/credit_note_format_in_gst.pdfIn PDF document text
    • http://dokukuke.mypressonline.com/kevudizelaroporamulokif.pdfIn PDF document text
    • http://mebosopevux.iblogger.org/adcraft_heater_proofer_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421639/normal_5fee879fa54a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ladurabazidema.onlinewebshop.net/accueillir_un_client_en_anglais.pdfIn PDF document text
    • http://vekifaxofezawe.epizy.com/metaphysical_poetry_penguin_classics.pdfIn PDF document text
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_baca7c2143b9497b8750cce3ac4fad96.pdf?index=trueIn PDF document text
    • http://jadabibobageror.epizy.com/disaster_report_4_plus_summer_memories_switch.pdfIn PDF document text
    • https://ccd4a2e6-63e2-4dcb-a02e-1ae1253dabcc.filesusr.com/ugd/059ff1_54f772e03a1740d3b5ed626963c318cb.pdf?index=trueIn 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_off0000f210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF210 5216 bytes
SHA-256: 10cbbd7745c74463a6d61f6e0268edca9da8a7b73f1ade6f0c39c9098cebc73b
font_01_sfnt_off000103ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AE 11172 bytes
SHA-256: 735ad4f8d34c607d5ee65dc122dd5ad44036e6747dfef9215a285e2f29c50976

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