Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f4d03a8a0a0c46…

MALICIOUS

PDF

67.9 KB Created: 2021-03-14 09:56:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: fcce3c3234be19cf245ee3513bfda944 SHA-1: cde2ae58e2dd04b13aa7bb86c4a502cce006bbcf SHA-256: a8f4d03a8a0a0c460fa6b53449cda2331a0ea281e8b110e6bed081c011ce7e1c
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'seumenha.ru', which is likely used to host or redirect to a malicious payload. The document body, though heavily obfuscated, suggests a lure related to downloading a calendar, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://seumenha.ru/award?keyword=english+malayalam+calendar+2020+pdf+free+download PDF link annotation
    • http://wusokamojifel.scienceontheweb.net/continuous_catalytic_reforming.pdfIn PDF document text
    • http://gedirobidepud.scienceontheweb.net/zasenoximulelesuv.pdfIn PDF document text
    • https://cdn.sqhk.co/risevejuxik/hNiiiaM/fipimixomipu.pdfIn PDF document text
    • https://cdn.sqhk.co/pinebiven/jbjcKbv/mituxujowinumigulepuj.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/KjbhcCL/panolobimoxe.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/TTijhdC/overkill_s_the_walking_dead_steamworks.pdfIn PDF document text
    • https://cdn.sqhk.co/posebozej/YYkghTH/83491273630.pdfIn PDF document text
    • https://cdn.sqhk.co/fekepazerox/NhaB0cK/twilight_fangs_romance_you_choose.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/invertebrate_paleontology_book.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/pafolipop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2f2a581-1c8c-40e1-a8be-5ccd92438a9f/hoover_windtunnel_3_vacuum_cleaner.pdfIn PDF document text
    • http://zegetafirotazaz.atwebpages.com/what_is_your_90_day_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/62657147141.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/9704759027.pdfIn PDF document text
    • http://rexefobixavater.myartsonline.com/what_is_the_best_portable_air_conditioner_with_dehumidifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/196c9a2a-5309-4a3a-ad80-6afd8453e07f/90_minutes_in_heaven_movie_synopsis.pdfIn PDF document text
    • http://bopewexe.onlinewebshop.net/budaya_betawi.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/chita_chola_see_darzi_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/erasmus_program_guide_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06e543bb-bac0-4a71-a6e4-9d57f21951ce/35383748691.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_off0000cbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB8 5992 bytes
SHA-256: 87c41759afcadd7382f2c733d556731bf550d12590b6d8e66fd2941d5a88f2a4
font_01_sfnt_off0000e00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00B 9932 bytes
SHA-256: 6b4be1803e54aa5f58c325afac88852cd730018d0cf65e9b1e92fc62b7dc667c

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