Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21ce24407bdca0b…

MALICIOUS

PDF

71.9 KB Created: 2021-03-18 17:17:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 5bb26b235e2b622935eb4cf580ffa4d0 SHA-1: 56f18fe79123c10bb954bb3e01a286803accf54c SHA-256: b21ce24407bdca0b20e39ef2a56998c973805b221f496b68e24d14eafa035d2f
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URIs, particularly the suspicious 'jumiwimov.ru' and 'sozaxesugoj.mywebcommunity.org', suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to wkhtmltopdf, hinting at its generation method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jumiwimov.ru/wix?keyword=persona+4+soccer+or+basketball+reddit PDF link annotation
    • http://sozaxesugoj.mywebcommunity.org/13148805287.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/what_do_u_mean_by_international_business.pdfIn PDF document text
    • http://sabovibin.medianewsonline.com/rimujunokinirodaxudepi.pdfIn PDF document text
    • http://sijojovimem.22web.org/lcm_and_gcf_worksheets_grade_8.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/1054351749.pdfIn PDF document text
    • http://sepotutudi.iblogger.org/wiganeji.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/23755330517.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tigaxulajaju.epizy.com/wewasukimakevom.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/pabapepawimanituli.pdfIn PDF document text
    • http://jenenulufem.rf.gd/fusixomisap.pdfIn PDF document text
    • http://zejibanunepi.myartsonline.com/91477983958.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e1a9150-05ca-4618-85a2-aa6f4870597d/ranuwovoxetixixagapubu.pdfIn PDF document text
    • http://kudarokerapoto.rf.gd/9569309509.pdfIn PDF document text
    • https://105d84dd-9b22-4355-af37-21382b2db671.filesusr.com/ugd/f4243a_05c6c679f3fa4a6aa18e1f9ca93c9d04.pdf?index=trueIn PDF document text
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_175e84beb21a4dc494d7590cf2261948.pdf?index=trueIn PDF document text
    • https://8a83ad47-1dc6-4e38-b726-138de0fe4a7e.filesusr.com/ugd/043c68_250df03bbb7849bb8e72aa3fad2356ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3333c95a-b650-41f5-9158-5a0e33eb5005/nawosusemerajazuruxuxe.pdfIn PDF document text
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_9401e096dc3140f9aa6c26f4c6a15a48.pdf?index=trueIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_296dcb455da244e19ad45a8ac19ddff0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/wotuwetiwewexizo.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/moral_hazard_and_adverse_selection.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/how_would_you_describe_the_smell_of_autumn.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_off0000dbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFA 5224 bytes
SHA-256: 0a2dd919ad8602764fc048bd1ee370a99f75502817115540a69d4b7b7d2c11a9
font_01_sfnt_off0000edd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 10004 bytes
SHA-256: 435d334e7ebdd7dc83df5469bc6a7cc51b5a817d18e6582681719b201a7758aa

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