Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7f75164f5bdf50…

MALICIOUS

PDF

74.3 KB Created: 2021-04-03 11:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 777a4935c769e23aa7609da053ca4b14 SHA-1: 2f415dd7e9bfddbc518b45ed051d22ea0e38817e SHA-256: 3f7f75164f5bdf50cfa9ac16d7f4084dfe71073a9995c08cf4b41f780281866a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on suspicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/aws?utm_term=weber+spirit+e-210+grill+dimensions
    • http://vosusapar.22web.org/effects_of_globalisation_in_south_africa.pdf
    • https://bomupafevusoze.weebly.com/uploads/1/3/1/4/131407549/polawabez_pexemazume_kipusotanudaw_pomur.pdf
    • https://serekarivevug.weebly.com/uploads/1/3/1/4/131407867/bulafitetodezo.pdf
    • https://wumezovavupod.weebly.com/uploads/1/3/4/7/134741594/kevepaxafevidej_kajufurip_xudize_lumidiwifuvaduk.pdf
    • https://rofubedojatedo.weebly.com/uploads/1/3/4/5/134586725/12401d0c9f4.pdf
    • https://sazadasixitabe.weebly.com/uploads/1/3/4/4/134404720/wexinovar.pdf
    • https://rusajilema.weebly.com/uploads/1/3/4/8/134853265/8958263.pdf
    • https://wunepilupizuxo.weebly.com/uploads/1/3/1/8/131857535/7597711.pdf
    • http://pivowave.iblogger.org/cantos_del_camino_resucito.pdf
    • http://tolufidefal.iblogger.org/73614654363.pdf
    • http://wolutat.iblogger.org/simple_past_exercises_hilfen.pdf
    • http://kosazajodexev.22web.org/zosawanogasejufabam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_b71547617f6e4399a7887c24b7ed04ac.pdf?index=true
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_7f0605150aa549d7b516a467fe0ce92a.pdf?index=true
    • http://pejinubonuxus.epizy.com/correlative_conjunction_exercise.pdf
    • https://uploads.strikinglycdn.com/files/ffefce35-9afb-4e6d-a605-0befc45aa071/13419770002.pdf
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_0b66798bdca04534b0d9977300140492.pdf?index=true
    • http://fiwipofel.epizy.com/84273727573.pdf
    • http://gowejolu.rf.gd/dreamweaver_cc_2019_tutorial.pdf
    • https://uploads.strikinglycdn.com/files/9b831c8c-c022-4def-8c2a-64ff35031f91/susezuvaramekiguwunujumal.pdf
    • https://uploads.strikinglycdn.com/files/d13dcfca-9ceb-485b-819f-f5457ca539e3/60971912566.pdf
    • http://dopexatatadad.epizy.com/pujerivunikekegawugo.pdf
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_10a3bb5c359f4cea97bf0129557bacf5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4b99dcf3-9623-48cf-b4c2-73aaf425a53e/is_captain_underpants_a_banned_book.pdf
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_d2f8698d05034d8888b849f19f7283c5.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e40a.bin
a7628a205b5b544481af77fa4d3833885769c106b053267f449505cf5bf74b07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE40A 5580 bytes
font_01_sfnt_off0000f70a.bin
23ef2e82fea6a87ca85ab881e8836b9465e10fc11a390d81f4c37fdbcd355462		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 10208 bytes

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