Malicious PDF — malware analysis report

Static analysis result for SHA-256 6785f78a68402ceb…

MALICIOUS

PDF

57.8 KB Created: 2020-12-09 20:50:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c30629ad59eb70295ef0c9387c59585f SHA-1: 12aae591584a3b4367aefa83b24b5afca6885305 SHA-256: 6785f78a68402cebf534acab4dbed141ba1bd08764d0769c5cf736bad281b226
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to 'trafffi.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to an 'answer key', aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=marigolds+by+eugenia+collier+answer+key PDF link annotation
    • https://pozujejax.weebly.com/uploads/1/3/4/6/134679154/3438957.pdfIn PDF document text
    • https://xewaxamuroz.weebly.com/uploads/1/3/4/5/134529724/ea24ca.pdfIn PDF document text
    • https://sogenaluvejor.weebly.com/uploads/1/3/4/3/134328850/6825401.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0da75085bf90c0efcd65a/t/5fc0f8c0e18c5c478e1ea79b/1606482116993/pufat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae5cf987-0e91-4c8f-b90c-0db95be5120c/livro_de_paulo_nader_introduo_ao_e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceeb8040-f7c5-4755-872e-37554085be80/canon_sx520_hs_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7921dcb6-68bb-44ee-86fb-7faa570d06e9/physics_free_fall_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/format_code_in_visual_studio_2012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66ac3c51-72b7-40a8-987e-2399cd230318/2066715451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c87a3e0-83d9-47a7-b9cc-fcf0366f16ff/zomem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2021f94-5497-49f9-ac11-e8666a98806b/pugeferaketojo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2a60b1c8c7413143d24fc/t/5fc386d8145a8629dc1df64e/1606649560589/iron_law_of_wages_marx.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_off0000a885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA885 5508 bytes
SHA-256: 9a49a2f139e54c9be64dcc165c276aee57936df5c4ec5fc0d1694fee1dd4ac59
font_01_sfnt_off0000bb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB73 9444 bytes
SHA-256: 79b7620dcb30728fb28d50706b7b7c543f2b3bfd5006be186b540e9ce7bc76e6