Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f4f990a41a76e9…

MALICIOUS

PDF

63.6 KB Created: 2020-11-30 13:16:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9635af5ecf5c1e99964d9187eaef3b9e SHA-1: 1ac460a202c69aab70c6b742138df817b5a4158a SHA-256: 94f4f990a41a76e9c6e02eb89a9558e6daa67494f4d8cbb094fb07d8c75938c6
96 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating an embedded external URI and is flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'activity series problems and answers'. The primary IOC is the external URL found within the document.

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://trafffi.ru/aws?utm_term=activity+series+problems+answers
    • https://cdn-cms.f-static.net/uploads/4402711/normal_5f9e33f7c7af6.pdf
    • https://cdn-cms.f-static.net/uploads/4470685/normal_5fc0980d5c987.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kawotexulozax/baba_black_sheep_poem_video.pdf
    • https://s3.amazonaws.com/tosevud/lithium_bromide_water_absorption_refrigeration_system.pdf
    • https://s3.amazonaws.com/sitozi/weather_report_of_ranchi.pdf
    • https://s3.amazonaws.com/falevi/42542597108.pdf
    • https://uploads.strikinglycdn.com/files/f6d8ac24-078c-423b-9461-3ed65b6054a3/naruto_tailed_beasts.pdf
    • https://s3.amazonaws.com/babuxufarizuxur/foundations_unit_test_study_guide.pdf
    • https://uploads.strikinglycdn.com/files/2594bbff-6fa3-4dbc-ac2f-9487de004600/vogaj.pdf
    • https://uploads.strikinglycdn.com/files/3b65c5b3-c357-4c75-a155-9528329684b4/28016118824.pdf
    • https://s3.amazonaws.com/zonebon/rowinup.pdf
    • https://uploads.strikinglycdn.com/files/dc20700d-271a-4e7a-b47c-abf8ddda518c/jakuxaliwadokamubixodi.pdf
    • https://s3.amazonaws.com/sizabo/87329853388.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_off0000b993.bin
722e97c233404d95694cd26f2321f053b67212b65c2873d41aecc5f202197925		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB993 5460 bytes
font_01_sfnt_off0000cc28.bin
cfe40ca79361ad42375f0c8d2ca210d1e8f65c68ffae9843eea82e63353227db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC28 11072 bytes

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