Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7ef0fee6939c53…

MALICIOUS

PDF

89.9 KB Created: 2021-03-25 02:04:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d93a654fcccc6074720cae1aecd473a7 SHA-1: 7fbd6a28328124b28cb00073c3de6c32cb4461b3 SHA-256: ad7ef0fee6939c53cda1e278566ff16bed4ae7b508c14fd1f0026f5b35d6fa09
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or content distribution mechanism. One of the primary external links points to a suspicious domain, kuzutuzo.ru, which is likely part of the malicious infrastructure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=sword+art+online+progressive+manga+buy
    • https://tomumexajozovod.weebly.com/uploads/1/3/0/9/130969356/2491131.pdf
    • https://nanotobu.weebly.com/uploads/1/3/4/6/134638189/rakoxisokuvin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/94ffb00b-4ac1-4397-8ce0-1a349b39dc3b/gesawitubuwe.pdf
    • https://uploads.strikinglycdn.com/files/1b2b8cf8-ed53-4a6e-8602-9629e7d9aa1c/fexesuwuniputunag.pdf
    • https://uploads.strikinglycdn.com/files/957d7de1-b8a6-4bf6-bf4c-40cd394413e9/how_much_to_install_22kw_generator.pdf
    • https://uploads.strikinglycdn.com/files/39dacfb5-7b87-40a2-8caa-6922e1283456/42693073767.pdf
    • http://wexejobi.rf.gd/leon_battista_alberti_ten_books_on_architecture.pdf
    • https://uploads.strikinglycdn.com/files/3e2327ea-9884-42de-9e43-d160f821b63e/what_is_the_best_quality_lawn_mower.pdf
    • http://batefagut.epizy.com/bitorawo.pdf
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_915821934b184fac8b59365b79f4caac.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d6635d13-67d0-44be-a0c3-3d0d28843f5a/8027346621.pdf
    • https://uploads.strikinglycdn.com/files/986a7061-1f4a-45c0-8b6d-52ab5cfe8a9d/how_much_can_you_earn_on_a_disability_support_pension.pdf
    • https://uploads.strikinglycdn.com/files/72a93671-ca05-4c8b-a293-fd44129e8faa/but_how_do_it_know_book_review.pdf
    • https://3caa4030-7dd6-4be4-8a8a-e1981c45b3cd.filesusr.com/ugd/704988_1dd5fc6c2beb4099a08894db01fcaea7.pdf?index=true
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_7ce221d2746c4cdebd37a8de5fd1e9b3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c1251250-a690-4e1e-9247-ab261fa77e0b/wiziwemidonojojabeluk.pdf
    • http://jidoreno.epizy.com/what_strength_resistance_band_for_pull_ups.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001141d.bin
8596f3477f1dbfe068875b7cc1630da36f3cad54491b85678c0f12a41f7c0f68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1141D 5656 bytes
font_01_sfnt_off00012758.bin
783d224c18fd5f7c3bb05d8806f06baa5e240b8d908fe3665c694718b3749aca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12758 10836 bytes
font_02_sfnt_off00014c35.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C35 4324 bytes

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