Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c7177256adc20e…

MALICIOUS

PDF

61.8 KB Created: 2020-11-16 21:29:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ba0bcf786a5967317c2d194a7ed2704 SHA-1: 6bf7228b243e3467721b2f97d6dd7656dad5f083 SHA-256: 66c7177256adc20e4918193e45520cecf0323df20987a9d2e641b0b12c38722a
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a site impersonating an answer key for practice problems. This URL is flagged as malicious by ClamAV and a machine learning classifier. The PDF structure also indicates potential duplication of objects, which is a common obfuscation technique in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafficel.ru/123?utm_term=force+mass+and+acceleration+practice+problems+answer+key
    • https://dudumopovidin.weebly.com/uploads/1/3/4/3/134308156/darusudewetewi.pdf
    • https://kudumegowejo.weebly.com/uploads/1/3/4/2/134266354/9125287.pdf
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/zanazanekoxel.pdf
    • https://xujarilo.weebly.com/uploads/1/3/4/6/134693127/viwewugonaboja.pdf
    • https://sulajaxa.weebly.com/uploads/1/3/4/3/134362611/77c704a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jiguwuzobozobaz/lefapolidipesiri.pdf
    • https://uploads.strikinglycdn.com/files/c22d6840-9c62-4cb7-8b0d-99d3e4bd516c/62382342332.pdf
    • https://uploads.strikinglycdn.com/files/fde00bc5-f11f-4a21-a1e7-4591ec537dc1/caracteristicas_de_una_columna_de_opinion.pdf
    • https://s3.amazonaws.com/sasufufa/calcium_containing_food_list.pdf
    • https://s3.amazonaws.com/nopomewegobij/total_gym_1700_club.pdf
    • https://s3.amazonaws.com/mejigavukolu/xapowivixukexir.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_off0000b320.bin
9ceb8d24fdf19af71ca8926c47da6008ed54857e303c88f7e554b24f6f357530		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB320 5572 bytes
font_01_sfnt_off0000c60a.bin
095febb3dd453c43fc85fe25a4138e3cab1e7c9223afff7b65990dace52f43fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC60A 10500 bytes

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