Malicious PDF — malware analysis report

Static analysis result for SHA-256 3531ea8bf5699250…

MALICIOUS

PDF

73.9 KB Created: 2021-03-01 18:47:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: eb879c6afbbb47a6e20858ee522e5a04 SHA-1: 0d044d87caa65933a9b80acb646b5a5fe38582ed SHA-256: 3531ea8bf56992509b54bc9bf71e986339399e5f5f7b86ee52ad4c186f0e0735
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs are indicative of a phishing or malicious content delivery mechanism.

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://dugedepap.ru/wb?keyword=mejores%20libros%20de%20fisica%20basica PDF link annotation
    • http://janurikemodowu.iblogger.org/tebenebupu.pdfIn PDF document text
    • http://foruzakitotilut.iblogger.org/zidafokuvodafisar.pdfIn PDF document text
    • https://wiraxupafetob.weebly.com/uploads/1/3/2/6/132696263/1790044.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/93242434850.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480732/normal_6014ca5db49b5.pdfIn PDF document text
    • https://luwiritogejoti.weebly.com/uploads/1/3/4/2/134266422/aca2896a57d8170.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://daforewepon.epizy.com/spanish_to_english_dictionary_free.pdfIn PDF document text
    • http://sumewapedujevi.rf.gd/kiwinodosonopukux.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/4988226934.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/94348670720.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/amrapali_new_song.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/our_god_reigns_chords_israel_houghton.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/the_debt_collector_2_full_movie_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/50201522846.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_off0000e20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20A 5236 bytes
SHA-256: 52626f19e24d194f66a28700ee3dccdcff45ebaf8ca277356a35ea1f088a3be7
font_01_sfnt_off0000f3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F5 11488 bytes
SHA-256: a9631911430c23593987f5f14f52a4bf9d52618f13f87407de60cd83059c599e

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