Malicious PDF — malware analysis report

Static analysis result for SHA-256 13225d1c3da486c5…

MALICIOUS

PDF

70.1 KB Created: 2021-02-03 03:49:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 802bd1f1806b0778f4a7c25fd2b5f5c8 SHA-1: 746e772123b7cb1501fa543033ceb041d30a20ee SHA-256: 13225d1c3da486c57eb74b23ee434832428ec60cb9eef8d6e46a2883959c1ce9
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-10044375-0' strongly indicate malicious intent. The document body, though heavily obfuscated, contains references that align with lures for downloading software or accessing specific content, further supporting the phishing/malware distribution attack pattern.

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 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://jottigo.ru/123?utm_term=pre+authorization+in+spanish
    • http://copyright-central-media.com/baixar_gta_san_andreas_para_pc_fracoz8ydn.pdf
    • http://luxililoxetina.iblogger.org/fundamentals_of_molecular_spectroscopy_banwell.pdf
    • http://nukels.xyz/vajijivolif39uvn.pdf
    • https://bukivobiwizu.weebly.com/uploads/1/3/4/0/134097020/3728389.pdf
    • http://vsedlyatebya.xyz/fanuzamogalitutepozikm8igj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tufuripisaren.epizy.com/zutomivitoxu.pdf
    • http://kogopixipinal.epizy.com/bhairavi_kannada_movie_video_songs_free.pdf
    • http://xulaxun.rf.gd/gewore.pdf
    • http://dilexaluv.epizy.com/59397930840.pdf
    • http://jisevara.rf.gd/1987056724.pdf
    • https://s3.amazonaws.com/bededuxotulapil/23620479281.pdf
    • http://famebod.epizy.com/60472528791.pdf
    • http://tosaxope.rf.gd/appendix_format_for_apa.pdf
    • https://s3.amazonaws.com/paropabaru/folders_for_school_reports.pdf
    • http://godemesefiw.epizy.com/jivizutebe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2e1.bin
bb451b81df1e06f1b2a21f6f9f4eb8691f195cb7743058c1d2811e910fd9eea5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E1 4928 bytes
font_01_sfnt_off0000e3a5.bin
da9271202a9991104bb929750073f32fee5ce2e9bde24690b25b093347699698		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A5 12424 bytes

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