Malicious PDF — malware analysis report

Static analysis result for SHA-256 b645594792ce23e9…

MALICIOUS

PDF

80.5 KB Created: 2021-04-03 07:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d098bf0e7240658d30bc4042499bd0dd SHA-1: 76c52b24ffd8c3d49ff2c12120bd9fde8d6409d7 SHA-256: b645594792ce23e90992a92e56a1276d22404e9c8d6f79d698b66db821cf2994
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and contains references to 'wkhtmltopdf', indicating it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://maypoin.ru/strik?utm_term=throne+of+fire+book+series PDF link annotation
    • http://creditreportusa.info/icao_convention_annex_94utea.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/33351872578.pdfIn PDF document text
    • http://memisada.mygamesonline.org/pijas.pdfIn PDF document text
    • http://funasowuto.getenjoyment.net/airtel_dth_ala_carte_channel_list.pdfIn PDF document text
    • http://bezprovodov.guru/williams_legato_88-key_digital_piano_power_supplybn4f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_6050ac4ebd05d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454546/normal_605c8c092de48.pdfIn PDF document text
    • http://retamos.mygamesonline.org/remifezufafozulegebo.pdfIn PDF document text
    • http://rostov-mobile-doctor.ru/76430087272lirix.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/charter_remote_setup_new_tv.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/attack_on_titan_gameplay_trailer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419001/normal_604de32c8a7cc.pdfIn PDF document text
    • http://gajaxujifusokul.mygamesonline.org/wuriwavobixorofowowowoda.pdfIn PDF document text
    • http://mailedflkf.site/906068769784pinb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445116/normal_5fe5525089cfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379968/normal_6014deb46efe6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_99f811b385cd46b68f7040c110b597fa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejobu/what_is_the_purpose_of_law_in_todays_society.pdfIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_d7efb256b8964144bed99bf75674d081.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sojenozap/buffalo_classic_lowtop_platform_trainers_in_black.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/how_many_zones_nj_transit_bus.pdfIn PDF document text
    • http://kewetanetoza.atwebpages.com/how_to_build_your_own_3d_printer.pdfIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_a8e59fdd443049aa91d0b878a312caa2.pdf?index=trueIn PDF document text
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_bc63e988c53d49d6af81f3ad042e6134.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_off00010002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10002 4768 bytes
SHA-256: 0fea2d3e101d154f1394e4159b73a14c1650ed74f417620d05736d604a49f4ef
font_01_sfnt_off00011033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11033 10628 bytes
SHA-256: e4a322d43601c48dda50a3fe6f05b8f37373f71069c6aedeee8358ab3e9aa624

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