Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a02ebc94a56382d…

MALICIOUS

PDF

73.4 KB Created: 2021-03-20 12:34:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78d6c7ba6c1aae872793b7537ac1be03 SHA-1: 2c7c9a8db1caae725fa92413a15dc06e561a3d8a SHA-256: 9a02ebc94a56382de636c0afdd6e223c805e6c05571d7044e205c3619ba060b0
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=ctet+answer+key+2020+paper+1+set+l+pdf+download
    • http://fuxarirudutosas.iblogger.org/wuwefofazabidovewot.pdf
    • http://susarivusu.22web.org/giritusepoj.pdf
    • https://cdn.sqhk.co/luvutagawata/M2IhcWx/66026804201.pdf
    • https://cdn.sqhk.co/lugizumevemu/fhbgiie/cause_and_effect_diagram.pdf
    • https://cdn-cms.f-static.net/uploads/4404107/normal_5fe8f92b08c45.pdf
    • http://zirevenezefele.iblogger.org/61339306654.pdf
    • https://cdn-cms.f-static.net/uploads/4406806/normal_5fd621db0b154.pdf
    • https://cdn.sqhk.co/jurugaguvedu/iYe6rJj/3ds_max_tutorial_architecture.pdf
    • https://cdn.sqhk.co/rixutixim/Iia2ii2/the_best_to_do_list_app_2020.pdf
    • https://cdn.sqhk.co/zugivakizo/egjhYie/dragon_quest_viii_3ds_review_gamespot.pdf
    • https://cdn.sqhk.co/nuvurero/hihejij/shoot_em_up_spara_o_muori_streaming_ita.pdf
    • https://cdn-cms.f-static.net/uploads/4455669/normal_6053566c49bf6.pdf
    • https://cdn.sqhk.co/jusupovexewa/jbP4yhj/free_license_plate_owner_lookup_ontario.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tatatomoti.rf.gd/49039327241.pdf
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_086e5f4ce0c143939dc50075863a2863.pdf?index=true
    • https://10bc5e17-7652-4c7e-9b43-999b3eb3b021.filesusr.com/ugd/5edc69_12ceab835f6849099c6550aadcd7164b.pdf?index=true
    • http://jagodadevigusef.rf.gd/swarna_akarshana_bhairava_stotram_in_telugu.pdf
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_370abffa469740ccb64d797a132f4e11.pdf?index=true
    • http://losalevova.epizy.com/zexapeji.pdf
    • http://mewazeni.epizy.com/whirlpool_gold_dishwasher_filter_location.pdf
    • http://bamoxogoxufoge.epizy.com/pivokib.pdf
    • 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_off0000dec6.bin
38c5e02b466087480e91abd9a3a115a02432a420a874bcf9eac7f204b15fc7d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 5524 bytes
font_01_sfnt_off0000f1bd.bin
02b75200b4d34ed89a4301d554ad44aa9be330203488e3ddc02570b36d88ae4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BD 10732 bytes

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