Malicious PDF — malware analysis report

Static analysis result for SHA-256 281c46f2fa0225d8…

MALICIOUS

PDF

72.9 KB Created: 2020-11-10 00:00:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1916ce7dfd00f75b22322d0c086011ba SHA-1: b032574fd98c5302c6a3f87d2c87ee12258a5144 SHA-256: 281c46f2fa0225d8400fe727eec406a1b2cdb66b6d74519b6d8a6915774ec747
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 suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to reference 'es file manager pro apkpure', suggesting a lure to download a potentially malicious application.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://trafftec.ru/strik?keyword=es+file+manager+pro+apkpure PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460057/normal_5fa4fb5b08fdd.pdfIn PDF document text
    • https://naletonuve.weebly.com/uploads/1/3/4/3/134381452/bdf163373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367617/normal_5f8827659adbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385412/normal_5f924eb1c950a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368782/normal_5f8b82a798934.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376369/normal_5f8c7ceee8552.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5fa258ecebc3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391909/normal_5f9ac3c7d0aa6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/nueva_ecija_philippines_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33564437-3bb4-4341-a08a-a79eb3fe4263/lavifuvumufadodakidutar.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC658 5240 bytes
SHA-256: 227c0653bc73217c3edcc7c1e28b10bf7da35d3347ea0363701ed8374d6a5570
font_01_sfnt_off0000d81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81C 13928 bytes
SHA-256: 62e6f2fa69f029b6a455b25d6cbbaffc7b28128601edb9eb4534fcbef91bb9cb
font_02_sfnt_off00010255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10255 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848