Malicious PDF — malware analysis report

Static analysis result for SHA-256 604d0a9a2eba0666…

MALICIOUS

PDF

76.3 KB Created: 2021-03-20 08:10:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 318dcb966d9177095fefc343dcc3edea SHA-1: 20fc68c6fcda59e1d37631a8a75e8734c7dc66ec SHA-256: 604d0a9a2eba0666a480b0e59b085f0e7bfeed7918dacb9703884456dafb3252
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://crophysi.ru/wix?keyword=pulseira+monitoramento+de+idosos
    • http://tefigizuvixan.22web.org/chapman_grammar_book_1.pdf
    • http://waverufusufafuv.scienceontheweb.net/refraction_of_light_class_11_target.pdf
    • https://static.s123-cdn-static.com/uploads/4493917/normal_5fe3dd4f6fb9f.pdf
    • http://vizenam.medianewsonline.com/25218448402.pdf
    • https://jedadizonavo.weebly.com/uploads/1/3/4/7/134721040/9a44a8ace0.pdf
    • http://kazaxukiga.getenjoyment.net/anisocitosis_causas.pdf
    • https://toruganaduloxo.weebly.com/uploads/1/3/5/3/135347606/5d26b1d130a6cce.pdf
    • https://lowonuve.weebly.com/uploads/1/3/4/5/134584544/f6d55.pdf
    • https://cdn-cms.f-static.net/uploads/4470839/normal_6019b931f2113.pdf
    • http://xuroriwonufuz.scienceontheweb.net/tofodigiwinon.pdf
    • http://gebogezu.22web.org/wafer_swing_check_valve.pdf
    • http://bidizujimon.getenjoyment.net/vizio_v-series_5.1_sound_bar_v51-h6_review.pdf
    • https://cdn-cms.f-static.net/uploads/4366005/normal_60149e1a2c80e.pdf
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/bimoxegafiguwu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nejesezape.myartsonline.com/brandon_burlsworth_death_video.pdf
    • http://pikugire.epizy.com/fidesunugute.pdf
    • http://kavibajegis.onlinewebshop.net/aasl_standards_framework.pdf
    • http://lulubanidoz.rf.gd/lilopuxeveratutezodip.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_off0000e971.bin
74725c3a47a418addb76fe22df551fe75eb2f816c61ed001eb59c8aa97817c4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE971 4972 bytes
font_01_sfnt_off0000fa3b.bin
f8c6cb8dacb3b8796db6b57d3a013b085b4f1c282f2473802ce77448c1612ec8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3B 13468 bytes

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