Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44bf13074c361a3…

MALICIOUS

PDF

73.7 KB Created: 2021-03-28 19:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2e76c466de6ba6775eeefd01a02d89e2 SHA-1: 11af9d81bf84a9c4e964e283775a6dc966ac8aee SHA-256: c44bf13074c361a3d95b16d9277c9cfff8fa6813cad4ed0cd6fd72c24c769fca
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs, with one prominent URL pointing to 'jacksth.ru' which is flagged as suspicious. Heuristics indicate the PDF is a link farm on disposable hosting and is classified as malicious by ML and ClamAV. The document body, though heavily obfuscated, suggests a lure related to a commercial agreement, aligning with phishing or malware delivery tactics.

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://jacksth.ru/award?keyword=acuerdo+comercial+union+europea+ecuador+pdf PDF link annotation
    • http://lifeeuro.info/how_to_write_a_review_about_a_restaurant1j4i8.pdfIn PDF document text
    • http://dotenipago.medianewsonline.com/bypass_gstrico.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411512/normal_5fceab4c9b5d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381085/normal_5fc9c9c71de18.pdfIn PDF document text
    • http://ag-management.space/ladki_beautiful_kar_gayi_chull_free0sisi.pdfIn PDF document text
    • http://helplnstagramoffice.com/52980062674h95l3.pdfIn PDF document text
    • http://baltika-trans.ru/helix_waltz_flower_event_guidepsyce.pdfIn PDF document text
    • http://tokio-2020.fun/the_antonym_of_the_word_solitude4g3jz.pdfIn PDF document text
    • http://dalnoboyi.xyz/scientific_citation_format_generator28t4h.pdfIn PDF document text
    • http://gufutaca3.xyz/ielts_reading_answers_of_jumping_spiders9hrj9.pdfIn PDF document text
    • http://rirurawixenane.iblogger.org/hemostatic_forceps.pdfIn PDF document text
    • http://gazizelasama.getenjoyment.net/ansiolitico_para_gestante.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/mubemutolewe/bajadujuba.pdfIn PDF document text
    • http://mosamafinewa.rf.gd/vagujebitezaribukeji.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/does_a_samsung_dishwasher_have_a_filter.pdfIn PDF document text
    • http://popofisofol.myartsonline.com/fuxijimusovepurawixu.pdfIn PDF document text
    • http://zogaxemajov.epizy.com/sajumidilatixol.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/kowibebawezumegofise.pdfIn PDF document text
    • http://tifilow.onlinewebshop.net/veiled_sentiments.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_off0000e202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 5112 bytes
SHA-256: 37a15a27f1f4bd2e7cf3fd08f8413c54f9f53a5fba252b5a5114d5a0ec7bf2bd
font_01_sfnt_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 11228 bytes
SHA-256: ae958be512d58e403a726e1caca7a821b3960912f326bb5f13940806852c481c

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