Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80df79967f9d5ea…

MALICIOUS

PDF

75.8 KB Created: 2021-03-22 14:16:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 7d39a9cbe90728517be48f4906e29980 SHA-1: 9e76a992f055ebb02a9391a865f5d2f48ffef169 SHA-256: a80df79967f9d5ea6f8ddba6b5b3b3974072c400ab284f99108b475a50e0256a
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. The document body, though heavily obfuscated, suggests a lure related to 'depression test questions pdf'. The presence of numerous external URIs, many on disposable hosting, indicates a link farm or phishing attempt. No scripts were extracted, but the PDF structure itself is leveraged for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/award?keyword=depression+test+questions+pdf PDF link annotation
    • https://livubefelamujir.weebly.com/uploads/1/3/4/8/134899239/2498057.pdfIn PDF document text
    • http://xilexevu.scienceontheweb.net/how_to_connect_onkyo_receiver_to_bluetooth.pdfIn PDF document text
    • http://tafukug.iblogger.org/72012760414.pdfIn PDF document text
    • http://pewekelexu.mygamesonline.org/breakdown_maintenance_planning.pdfIn PDF document text
    • https://viwitilabepimep.weebly.com/uploads/1/3/2/6/132695477/gusarawum.pdfIn PDF document text
    • https://suzixibaru.weebly.com/uploads/1/3/4/7/134709676/4c47e420f3.pdfIn PDF document text
    • https://risonozolediwar.weebly.com/uploads/1/3/1/3/131398017/eb1f3ed87bed.pdfIn PDF document text
    • http://kevakigev.medianewsonline.com/assignment_front_page_aiou.pdfIn PDF document text
    • http://gewabezunapasa.iblogger.org/34222716679.pdfIn PDF document text
    • http://ruwakus.22web.org/6946703649.pdfIn PDF document text
    • http://duboxol.iblogger.org/zanuninupulerob.pdfIn PDF document text
    • https://cdn.sqhk.co/wolanojijen/jige6my/92870232565.pdfIn PDF document text
    • https://cdn.sqhk.co/lexebogefaj/7hdynjc/galaxy_stars_for_room.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/Zdid4ij/man_down_rihanna_lyrics_genius.pdfIn PDF document text
    • http://tozepefaj.iblogger.org/20678074737.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zerowegujij.onlinewebshop.net/metabolism_process.pdfIn PDF document text
    • http://zovagesilamijuj.epizy.com/wimujazebofijobulez.pdfIn PDF document text
    • http://foraxevub.rf.gd/skyrim_jaysus_swords_locations.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/c_o_c_hack_mod_game.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/motorola_hx550_bluetooth_for_sale.pdfIn PDF document text
    • http://wonanikapudidak.atwebpages.com/salirigap.pdfIn PDF document text
    • http://desixomagi.epizy.com/cheap_carfax_report_sulekha.pdfIn PDF document text
    • http://sujidise.epizy.com/63050401223.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_off0000eed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED2 4920 bytes
SHA-256: 882da732c23bf86da2a929cf048aec24dbd916240bac9dca60b1f8dee8cb7775
font_01_sfnt_off0000ffa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA2 10032 bytes
SHA-256: f5ae43e4fa8ac4fab32c122260d2d86f6076b9b6a6c8e835d8939393f23cc488

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