Malicious PDF — malware analysis report

Static analysis result for SHA-256 2396fcc29ef7789c…

MALICIOUS

PDF

124.2 KB Created: 2021-03-15 21:20:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7e995a86627ede7368613cb4c6e038cf SHA-1: e53fff741745252403bbe9ab5e8a1d47f01c7acf SHA-256: 2396fcc29ef7789c3a96323dd204240645adfaadca4572467c4e8257665a2923
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a phishing or malware distribution attempt, likely leveraging spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/123?utm_term=cellulose+debris+termite+report In PDF document text
    • http://fulokixowo.scienceontheweb.net/midojowifukudepizolifu.pdfIn PDF document text
    • http://fobexugelego.getenjoyment.net/how_to_answer_a_what_inspires_you_question.pdfIn PDF document text
    • http://nibakelenixezas.getenjoyment.net/navoleju.pdfIn PDF document text
    • http://femonejigajape.mywebcommunity.org/johnny_b_goode_tab_intro.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/zagapaxa/murray_42_inch_deck_belt_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/vikunimovinagos.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/63860760445.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/cadillac_xt5_2019_manual.pdfIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_55d84f709aab4b8dac17660ff23643e0.pdf?index=trueIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_4686be7727be4a11a43066772c49fad2.pdf?index=trueIn PDF document text
    • http://kadoxosin.atwebpages.com/lady_midnight_book_2.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/mipipiju.pdfIn PDF document text
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_4cfcf8f35dd54e8a8bee13622070c458.pdf?index=trueIn PDF document text
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_07228675b5464648b7ce56ee81964824.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/genetics_of_sickle_cell_disease.pdfIn PDF document text
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_c1647318070146f99e6be1bbc40cb025.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/nemirabog.pdfIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_b453d25e6e8c4fd5a5e1c72c57dee34d.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_off0001a497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A497 4940 bytes
SHA-256: dc2ec042ad2cf19f74e4e6acdcf5a0c553baf9cb4e9e6c7124e23cc5abc626e4
font_01_sfnt_off0001b53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B53C 14480 bytes
SHA-256: b0480e2d99aa3e6153cc17187a6d13b059bcd701f042cf5e8c25edbeb83e2d3a

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