Malicious PDF — malware analysis report

Static analysis result for SHA-256 19beb7237535339a…

MALICIOUS

PDF

85.0 KB Created: 2021-02-16 16:13:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b339516d750d21d614f6bffef36d8f8e SHA-1: 754dbebb00ba39785d786a26f3cdfcde28920a0e SHA-256: 19beb7237535339a217326d402729ab22f826560f58ae6e38e3e2cf9d385079c
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, suggesting it functions as a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to potentially harmful external 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 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://maypoin.ru/wb?keyword=the%20crucible%20act%203%20quotes%20abigail PDF link annotation
    • https://nelemiken.weebly.com/uploads/1/3/4/7/134704654/fupidasofudo-jivuzaxal-sabetoreta-lurotavab.pdfIn PDF document text
    • http://napojenewojiro.22web.org/malamunilagumepapoviwudep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365635/normal_60092ca8f2d55.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/dLGghgd/easy_printable_crosswords_with_solutions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390643/normal_601e25c4caf96.pdfIn PDF document text
    • https://kebumemimax.weebly.com/uploads/1/3/1/6/131636814/9a34733.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462035/normal_5fff4c62b7a71.pdfIn PDF document text
    • http://kerubidezarido.iblogger.org/char_broil_gas_grill_manual.pdfIn PDF document text
    • http://riwuveroxuwox.66ghz.com/sodium_hypochlorite_formation_equation.pdfIn PDF document text
    • https://tezosarotijup.weebly.com/uploads/1/3/4/3/134305137/1906be50752495.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://renodiwug.epizy.com/scream_go_hero_eighth_note.pdfIn PDF document text
    • http://fanofajuduma.rf.gd/jammu_live_weather_report.pdfIn PDF document text
    • http://nupopejif.epizy.com/966108558.pdfIn PDF document text
    • http://wavubodalut.epizy.com/xepotemenilif.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_off00011091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11091 5440 bytes
SHA-256: 0c5d9bab3aa7d5c3198083690413950a75f43248577a7849b9e7f12b99391da2
font_01_sfnt_off0001230b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230B 10552 bytes
SHA-256: 1af21149cf63a2305b38b3bd38bbf6b5f4fd0391b4ca859ba7acd8b150a1d30a

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