Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb66fe4b3c8f07ec…

MALICIOUS

PDF

73.6 KB Created: 2021-03-07 13:44:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 4f9eab024f4d53a2e6743058a7b3600d SHA-1: 36ed27e4d41e60ad7752ddf57ffffa742f3d8b8c SHA-256: bb66fe4b3c8f07ec5bb70ca37c2d327cd0c8c5447f5aee4724a9be14a1d4cc7d
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded URLs, including one pointing to 'zajinet.ru' which is suspicious, and another to 'ronapidilejok.rf.gd' which is identified as a link farm. The document body, though heavily obfuscated, suggests a lure related to a 'Yamaha stryker workshop manual'. The presence of external URIs and the link farm heuristic indicate an attempt to redirect the user to malicious content.

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://zajinet.ru/wix?keyword=yamaha+stryker+workshop+manual PDF link annotation
    • https://cdn.sqhk.co/rijomawonuj/dGhj5hc/70165613283.pdfIn PDF document text
    • http://zuxenegobepejij.22web.org/gukidexigokogiwovut.pdfIn PDF document text
    • https://rofasaxoropop.weebly.com/uploads/1/3/5/3/135316675/fofuzilelo-vuzavurupo-zukapebu-lefuvewulepisu.pdfIn PDF document text
    • https://jabekidedur.weebly.com/uploads/1/3/1/6/131636775/gejusuwo.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/como_hacer_un_bosquejo_de_predica.pdfIn PDF document text
    • http://vasamekekegu.iblogger.org/xojejewifawowigoluf.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/3D9Iifb/ufc_news_today.pdfIn PDF document text
    • http://nulivanofika.mygamesonline.org/dapikenamiteri.pdfIn PDF document text
    • https://sivikowililip.weebly.com/uploads/1/3/4/5/134599649/rinaxozulukila.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://ronapidilejok.rf.gd/camp_x_ray.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/can_you_audiobooks_to_iphone.pdfIn PDF document text
    • http://wudemexa.myartsonline.com/tuxasuvetufanigirok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9685c3d-c227-4713-ad5a-19381723d169/94950225706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc95d0d9-37bc-4a83-b8b1-ff338ab034ca/68471239614.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/performance_parts_for_pit_bikes.pdfIn PDF document text
    • http://kajomeki.epizy.com/87631817192.pdfIn PDF document text
    • http://tuxefunuzire.atwebpages.com/basic_biomechanics_susan_hall_7th_edition.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD649 5112 bytes
SHA-256: e4a592f4c5b8700b0e8a122af4e25cf89355bb78817a04dfbe83d4b88726d389
font_01_sfnt_off0000e79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79C 10280 bytes
SHA-256: 060c6d1cdc4b1a291ee51b1c7c020b753fe13e7c2d9557860a2d36f14d6ab6f1
font_02_sfnt_off00010aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEB 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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