Malicious PDF — malware analysis report

Static analysis result for SHA-256 32034fbd6a1253c9…

MALICIOUS

PDF

93.4 KB Created: 2021-03-22 00:54:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89e006e4b0a4d539dc9aabcae79a5f6c SHA-1: 90b0e8678ab634f81457b878ce7f2e2ead945fa2 SHA-256: 32034fbd6a1253c9b328f9811d64d529cc52108c65b8662cb58982552419b42b
96 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded URL, https://vilenefex.ru/wix?keyword=organic+functional+groups+worksheet+answers, suggests a phishing or credential harvesting attempt by luring the user to a compromised website. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, potentially indicating it was generated by a tool for malicious purposes. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://vilenefex.ru/wix?keyword=organic+functional+groups+worksheet+answers
    • https://cdn.sqhk.co/rafumufo/OhjjbuN/85886137818.pdf
    • https://cdn-cms.f-static.net/uploads/4426551/normal_60467893c744a.pdf
    • https://cdn.sqhk.co/lowilufape/gc1ghig/cg_dj_video_2018.pdf
    • https://static.s123-cdn-static.com/uploads/4466398/normal_6006313c4816d.pdf
    • https://cdn-cms.f-static.net/uploads/4450502/normal_600f3fafebfcd.pdf
    • https://cdn.sqhk.co/vusutesilo/jciiHii/bilomorabibasoxive.pdf
    • https://cdn.sqhk.co/leruwexikud/AJjdDja/cruise_companies_australia.pdf
    • https://cdn.sqhk.co/bafiweba/hgjeShi/67008341339.pdf
    • https://cdn-cms.f-static.net/uploads/4479902/normal_60205599f0a82.pdf
    • https://cdn.sqhk.co/mamevugixej/ZHig0hj/10005648849.pdf
    • https://static.s123-cdn-static.com/uploads/4384642/normal_5fc898838066a.pdf
    • https://cdn.sqhk.co/wowobavukelo/ciaTree/diamond_heaven_jewellers_london_hatton_garden.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/67df234c-4869-432e-a427-41f6f12a7d44/nunamajamajekizunitiwoz.pdf
    • https://uploads.strikinglycdn.com/files/986b7d1c-cabc-4cb7-9a95-f556d641756b/6451026667.pdf
    • https://uploads.strikinglycdn.com/files/4226d3a1-5529-4df1-a833-3403c6739446/hp_4630_printer_wireless_setup.pdf
    • https://s3.amazonaws.com/winumigutam/filapu.pdf
    • https://uploads.strikinglycdn.com/files/1d5bebb3-e260-4e77-8ee5-8a6ed58c1d9c/88085649301.pdf
    • https://uploads.strikinglycdn.com/files/ba939447-8d1f-43b2-81c9-a5a784fb0ccf/69418714733.pdf
    • https://uploads.strikinglycdn.com/files/efe1b92b-eb5e-415a-a03c-9098dc533ed9/dyson_dc18_spare_parts.pdf
    • https://s3.amazonaws.com/legesiliv/english_conversation_worksheets.pdf
    • https://s3.amazonaws.com/babetafaperaxov/legrand_cable_trunking_catalogue.pdf
    • https://uploads.strikinglycdn.com/files/58ef10a0-45c2-4de2-a639-9164abd148f4/frigidaire_fad704dwd_energy_star_70-pint_dehumidifier.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_off00012e8e.bin
793201854eef67421b35336d8bb1d2031c99895e570d7b564def1ea4fdfd1791		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8E 5460 bytes
font_01_sfnt_off00014136.bin
0d581a555061c96f61a8935cfe190dd8912a17360704b06aa4fb946a3059a1f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14136 11452 bytes

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