Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7c95dc837c6528…

MALICIOUS

PDF

76.2 KB Created: 2020-12-27 12:14:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 196fe5f6aa3b1521d0f5c7c57c77a0ba SHA-1: 43edc22d40948912595fbc4532e124d761673d17 SHA-256: fa7c95dc837c652889d51531038a59d2531be197917086dfa156d765c948c726
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 credential harvesting or malware distribution. The document body, though heavily obfuscated, references 'Android 9 auto start app', suggesting a lure to trick users into visiting the malicious link.

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://trafffe.ru/aws?utm_term=android+9+auto+start+app PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4473041/normal_5fcad0c47d143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379053/normal_5fae8894b8316.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382621/normal_5fd62b1d4d8fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445334/normal_5fdd6ac3cacb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382976/normal_5fad7c5013f43.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a6ec812-a66c-4371-9ec6-985a530287a3/john_deere_f525_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/neoclassicismo_e_preromanticismo_letteratura_italiana.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/15547975232.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/zorelivorejafujof.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/zokuzivamavopuxepejixeso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8a47351-5fbe-43e1-ab4a-f60711daefc5/87132971817.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_off0000ece5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE5 5068 bytes
SHA-256: e6277e40bac8291df886147ce576542cce8f9604bd675b02e735b542ae8682e5
font_01_sfnt_off0000fe32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE32 11128 bytes
SHA-256: f3d3b5b17322cf0ff2a88212792cd8672554520e013e4da105b79ae94842b878