Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad53ec7c3ce0ede…

MALICIOUS

PDF

78.9 KB Created: 2020-11-26 02:20:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 52c4cc17f184c2c8f54c39960fcdb5d4 SHA-1: 175a7c7ec86f67d9ed9db80d868f096f9ece3a65 SHA-256: 6ad53ec7c3ce0ede1bc8898ba35cc5730be0da46eb8b1b9307098410088dc6e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, identified as a PDF link farm, with one prominent URL being trafffi.ru. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. No scripts were extracted, but the presence of numerous external links points towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafffi.ru/strik?utm_term=devil+in+a+new+dress+sample+song PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365627/normal_5f933dc2bff61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5f8942165701f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f874e15cfce0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385030/normal_5f99476b2cbd2.pdfIn PDF document text
    • https://kofaxikizija.weebly.com/uploads/1/3/4/3/134336932/ligat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448113/normal_5fa684b26047c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402246/normal_5fbab9230adbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454671/normal_5fad257bbba37.pdfIn PDF document text
    • https://nudomituge.weebly.com/uploads/1/3/4/6/134677479/woves.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366993/normal_5f96006866f19.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/749bad3e-c9df-47f9-a698-abb5a086950f/chemquest_29_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d50e899-5341-485c-8110-fde8dae53813/47484782663.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/zuwururikazoxidokureje.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/zuzugafirakizikimu.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/chashme_baddoor_movie_songs_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/86093060573.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_off0000f8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 5432 bytes
SHA-256: 53ef1a3b12d7ff985a3c77d93bb1628b3a8c5958b8d3088907bddb8e03944955
font_01_sfnt_off00010b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2B 10336 bytes
SHA-256: bb03decc4eb3c12cc9b9288cfa51fa40fcd2d4526d72abc6b1d3b8ee58d2352e

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