Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b4ebf80d50a56b…

MALICIOUS

PDF

68.0 KB Created: 2020-12-03 12:10:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 75b85aeccfa5c6ff4a235e7d77a3b054 SHA-1: 5fc9dc13dd4ba3ac07a8a2f9ca1d63bede7c41af SHA-256: 81b4ebf80d50a56b0ba78aec39e3f889b7a088c76821a6863c69147a3feecb90
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 'traffset.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, contains text related to 'Paint tool sai apk mod', suggesting a lure to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/strik?utm_term=paint+tool+sai+apk+mod PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473340/normal_5fad87a448204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457008/normal_5fba9f88b7fc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366375/normal_5f8fae64449a7.pdfIn PDF document text
    • http://www.opentle.orgIn 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/5fbfe895e5c7695ca99606f9/t/5fc473aef8cdb769c6726206/1606710191137/ledazetov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28127cc8-1d2b-4495-8404-2cb3fca030b0/bexewonafiguwigedinazid.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf48f94e98326c02068af7/1606371577903/nogimovavawomelo.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/dogamabosolewinak.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/rosezusilivoweripovaziv.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf59374f98375720d77ad6/1606375745099/vategijakowapepibabazewa.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/el_amor_de_dios.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc00a03c6229360eca839ab/t/5fc0d7d79b1ed03538fb2d4d/1606473687811/javawifuwi.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/ironman_barcelona_2019_athlete_guide.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000c915.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC915 8132 bytes
SHA-256: 1cfb919a2a4bea2264b7abbdf7374338b88019afbfbdf79debb636b3056bf25a
font_00_sfnt_off0000b7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EC 5072 bytes
SHA-256: 0edd4b09135774bb7324e2cf79290f39b58008d3d83e24652eab413abb78fd5d
font_02_sfnt_off0000df9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9F 10504 bytes
SHA-256: fb0959a8297b7d0198b5e51530a77ad884faeba19631a444567fa14fef8fc3cf

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