Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ab903b49926cac…

MALICIOUS

PDF

86.0 KB Created: 2021-04-20 04:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fdbaf7206ce3f0bded41152c322be61 SHA-1: 93866639f3966051e800ec08e6bf6420ecfa097f SHA-256: c4ab903b49926cac74d771d7bac8ab50cb49616ad0bf3a22d6f658fa841df2f5
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 URL that directs users to a suspicious domain, likely for malicious purposes. The document body, though heavily obfuscated, suggests a lure related to image editing, which is a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=how+to+save+transparent+background+in+ms+paint
    • https://cdn-cms.f-static.net/uploads/4480889/normal_60535f37d6c06.pdf
    • https://cdn.sqhk.co/dutudovajud/jgdshaE/gardenscapes_level_2560.pdf
    • https://static.s123-cdn-static.com/uploads/4484804/normal_5ff2ff6424192.pdf
    • https://cdn.sqhk.co/goworonol/ejcu3gd/hearts_of_iron_5_cheats.pdf
    • https://cdn.sqhk.co/daviluzabidi/hffhfYm/kalopuvagu.pdf
    • http://lumasilove.iblogger.org/ultrasound_guided_shoulder_injection_procedure_note.pdf
    • https://cdn-cms.f-static.net/uploads/4368468/normal_602764ab44ca4.pdf
    • https://cdn-cms.f-static.net/uploads/4459805/normal_600b2153dc1f7.pdf
    • https://cdn-cms.f-static.net/uploads/4458833/normal_6012ce5906068.pdf
    • https://cdn-cms.f-static.net/uploads/4467325/normal_60559aefb07ca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/3b3ab49f-1182-4e95-b882-1c89642e1c6e/biblia_de_jerusalen_1967_gratis.pdf
    • https://uploads.strikinglycdn.com/files/7d721fb9-4081-4a14-85a4-fe9a686e4557/16777104513.pdf
    • https://s3.amazonaws.com/vexosafugunu/guba_and_lincoln_research_paradigm.pdf
    • https://uploads.strikinglycdn.com/files/0eda1c0b-ac56-4302-ad24-449c0db3593b/how_many_ounces_in_small_dunkin_donuts_iced_coffee.pdf
    • https://uploads.strikinglycdn.com/files/2ce6da72-dfa7-43b0-abfd-d62199e13144/sex_offender_housing_houston_tx.pdf
    • https://s3.amazonaws.com/fulazelof/janopugarugewusilud.pdf
    • https://uploads.strikinglycdn.com/files/9e5ac19d-4f5a-4a13-a538-cf600b0d578f/38011607787.pdf
    • http://vabuperupijod.epizy.com/sexual_orientation_demisexual_meaning_in_hindi.pdf
    • https://s3.amazonaws.com/seriposuj/58143115350.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001031a.bin
5f945e7d9ec5af40648edde89e7a84efa717bd669bac061e66c9b9b9c044226d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1031A 5560 bytes
font_01_sfnt_off000115f8.bin
41104fff3a746d79506e1f2a022dc6dc7b86af1e2f62db850ec3ed17ffd8c18b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115F8 11256 bytes
font_02_sfnt_off00013c44.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C44 4324 bytes

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