Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef383f8e1d64717f…

MALICIOUS

PDF

69.2 KB Created: 2021-01-23 15:04:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 17fd1dc316d9a0861bcb59685c9af8e5 SHA-1: d07a619868638963df2b6aa1551db321b0276d37 SHA-256: ef383f8e1d64717f540fd50d31862658ac2bfdee932c4d0947e8d83baf2a174d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, which are characteristic of a link farm designed to host malicious content or redirect users. The document body, though heavily obfuscated, suggests a lure related to song lyrics and chords, likely to entice users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=letra+y+acordes+de+canciones+romanticas+pdf PDF link annotation
    • http://sanadewa.iblogger.org/slope_intercept_form_to_standard_form.pdfIn PDF document text
    • https://site-1177542.mozfiles.com/files/1177542/94048888354.pdfIn PDF document text
    • https://site-1175951.mozfiles.com/files/1175951/cars_3_trailer_sonic.pdfIn PDF document text
    • https://site-1175548.mozfiles.com/files/1175548/tafelij.pdfIn PDF document text
    • https://site-1168148.mozfiles.com/files/1168148/script_analysis_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375361/normal_5fef6200a58d5.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/lorifawuvawot/vakuberelebal.pdfIn PDF document text
    • http://zukisofom.epizy.com/rainbow_tables_mac.pdfIn PDF document text
    • http://sivokag.epizy.com/17858997041.pdfIn PDF document text
    • http://dafawesag.epizy.com/challenge_rift_diablo_3_guide.pdfIn PDF document text
    • http://texatutegelemov.rf.gd/hierarchical_organizational_chart_template.pdfIn PDF document text
    • http://povasapodojika.epizy.com/beamdog_baldur_s_gate_2_android.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/75104303864.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_off0000cf6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6B 5312 bytes
SHA-256: 139b48c900269e9962bdb43aacfd85eaa4259d41b782f00cd7dd53bf0d1400af
font_01_sfnt_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 11764 bytes
SHA-256: a8f7bbec8731fb8cf4c81d44aada2e3125c0451485f9caac33ffabaed39c0805

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