Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d72314331773e6…

MALICIOUS

PDF

80.9 KB Created: 2021-03-10 16:25:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5bc2d1899a93200c8bedfa6df1345a4d SHA-1: e28233331d8f027ea64d7da379e81df16710e93d SHA-256: 91d72314331773e6b66d5bff5ebf87a9d8941611421f06869b0fae362764cf2e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, particularly those hosted on disposable domains, suggests a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://jottigo.ru/award?keyword=typescript+blob+pdf PDF link annotation
    • http://vekisonoloze.sportsontheweb.net/72222420486.pdfIn PDF document text
    • http://fevinoreniwelik.sportsontheweb.net/benin.pdfIn PDF document text
    • http://folugomobok.getenjoyment.net/fosetunop.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/fender_super_champ_xd_service_manual.pdfIn PDF document text
    • http://nujinedopidil.iblogger.org/71472555222.pdfIn PDF document text
    • http://doxedisipi.scienceontheweb.net/what_are_the_two_types_of_semiconductor_mcq.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/dibujo_de_cara_de_nio_para_pintar.pdfIn PDF document text
    • https://$-account.blob.core.windows.net$In PDF document text
    • https://$-account.blob.core.net$In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kigavanus/el_imperialismo_del_siglo_xix.pdfIn PDF document text
    • http://volowunodevikel.rf.gd/gilovuvetotiresu.pdfIn PDF document text
    • http://remibuvemofe.epizy.com/what_is_design_in_education.pdfIn PDF document text
    • https://65de77fc-0341-4fd2-89b2-cd6b005a91de.filesusr.com/ugd/cf79db_13218439fd634ffe958736f506390140.pdf?index=trueIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_6b12b8bec6ca4112957c4c75a036c5bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/dazaxolitujosapofo.pdfIn PDF document text
    • http://deketinak.rf.gd/78774625400.pdfIn PDF document text
    • http://gapoxuvopa.onlinewebshop.net/what_are_the_5_dynamics_of_dance.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/short_notes_biology_form_4_chapter_9.pdfIn PDF document text
    • http://wonegesaf.epizy.com/21793639239.pdfIn PDF document text
    • http://xasiruzate.rf.gd/banner_design_tutorial_in_photoshop.pdfIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_1a9cc1d2517b4df6854fbaf918b45bd0.pdf?index=trueIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_d711465e0eab499cb53633ead306b363.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/surface_area_cone_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/92388049297.pdfIn PDF document text
    • http://vexabimumemig.atwebpages.com/kunixen.pdfIn PDF document text
    • https://$-account.blob.core.windows.netIn 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_off0000fbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFD 5128 bytes
SHA-256: 7b61a4ae95dd6c310cf6a36dfdc32e646e2eccefec32db41b43d4cf2e50e5fb1
font_01_sfnt_off00010d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D84 12544 bytes
SHA-256: 25239bab49fd1d48a177ef3dca0dab2895d459bb7d57d348749b0532beb96411

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