Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc893444de8675b…

MALICIOUS

PDF

110.9 KB Created: 2021-01-11 18:35:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f74c0978c9f37fbe1a8d92f3f3ec5721 SHA-1: 5c42a651a17bd70911bf42fff6e05a66eb495aca SHA-256: ffc893444de8675b2219e9b09897e36abba753dea298fd06dc78ab583d9d476d
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 pointing to 'trafffe.ru', which is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to a 'Ff14 class guide 2018'.

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=ff14+class+guide+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491936/normal_5fbd6ac62884f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388050/normal_5fd70cced315c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444882/normal_5ff24b2dcac8a.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/aB7tqgd/video_call_samsung_s9_to_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459321/normal_5fb2922e9c27b.pdfIn PDF document text
    • https://cdn.sqhk.co/nugutobudan/ibInidn/stackball_smash_falling_helix_ball_3d_print.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470964/normal_5faddbd0a465f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391909/normal_5fc73f557f122.pdfIn PDF document text
    • https://site-1194674.mozfiles.com/files/1194674/jiber.pdfIn PDF document text
    • https://cdn.sqhk.co/litalile/Npoicid/71842914112.pdfIn PDF document text
    • https://cdn.sqhk.co/rawegili/gehcjaj/black_and_grey_frog_tape_wall.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370317/normal_5f8a46d3928b6.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/matogapibelifiv/lidewugifuriza.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_off00017333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17333 5656 bytes
SHA-256: dbf08817ce05c18e9448f96e761534e33e2d5813a6844de4989c53c51e59088f
font_01_sfnt_off00018698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18698 13104 bytes
SHA-256: ed303995f55fd68230ba9325e59c0061809e95a75d794e0219cb40e74d7d28d4