Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d8a5805f4d9e83…

MALICIOUS

PDF

73.5 KB Created: 2021-03-17 11:13:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b8afc42167c2e26aba946a1fc8ec505 SHA-1: 7e37dade7754c8f13e5ec2a1916fccafa3b93217 SHA-256: 75d8a5805f4d9e83be7fe36ecf165c1def88c3a9c536f27e087b4e6f9ee14aad
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, suggesting it is designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a keyword search, reinforcing the lure of an archive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/wix?keyword=the+50th+law+pdf+archive
    • http://community-day.ru/tuwuwazopikojetofop3vnj.pdf
    • http://dfahsdfgjsfg.online/senup3b9zr.pdf
    • http://lixorajepidil.mygamesonline.org/what_is_civil_religion_in_sociology.pdf
    • https://cdn.sqhk.co/rijomawonuj/edgchaA/enemy_strike_2_mega_mod_apk.pdf
    • http://glawerry.online/owners_manual_cancun_rentalsf8zmv.pdf
    • http://about-igsupport.com/51398508291lj4ti.pdf
    • http://kajejib.medianewsonline.com/research_paper_example_apa.pdf
    • http://tryadasert.online/154916850139fdit.pdf
    • http://bokaxakoz.sportsontheweb.net/waste_management_plan_sample.pdf
    • https://cdn.sqhk.co/fagijopi/ibSPiaU/social_dashboard_template.pdf
    • http://pidawudimo.scienceontheweb.net/digitech_trio_band_creator_and_looper_review.pdf
    • http://silver35.ru/mofavadetogemoteritefefwgppu.pdf
    • https://cdn.sqhk.co/zikonidenijo/jjigcha/traffic_racer_3d_game.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tobobowu/wejozowaxepezen.pdf
    • https://uploads.strikinglycdn.com/files/de452ae6-51b0-4d21-86e3-33d61775a4ee/29709693954.pdf
    • https://uploads.strikinglycdn.com/files/cb7d3720-617b-49bd-846c-d9032c22e94c/latitude_e6410_battery_not_charging.pdf
    • https://uploads.strikinglycdn.com/files/aded4e82-5e8a-4d67-90e2-34342d5b3a49/how_to_use_my_pressure_cooker_for_canning.pdf
    • https://uploads.strikinglycdn.com/files/1cbae295-6426-4241-8eaa-630e5a57f112/what_does_johnsons_reconstruction_plan_call_for.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_off0000e162.bin
228d2e40b00a110673b56b503f289f25e6dd972fdefe7423b84bd4781e1963fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xE162 5432 bytes
font_01_sfnt_off0000f3fb.bin
5efa3e3b710892d9418af458b4e6dcedbc3dd7d2587f0acedef25bc49a1ba648
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FB 10840 bytes