Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f0a9aac16d2e9d…

MALICIOUS

PDF

67.1 KB Created: 2021-03-18 05:54:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: fb2ba262ecd9878631e82bcbdb1fa9da SHA-1: a737e62526f3e9903297c60f9cdebd510b10d471 SHA-256: 44f0a9aac16d2e9dc6f093ac2db11958b5938d9a5f88e1be86b68c6e162ca502
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'modern world history chapter 9 assessment answers', indicating a phishing or redirection attempt. The presence of external URIs and link farm heuristics strongly suggests the document's primary purpose is to redirect users to potentially harmful websites.

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://nipisod.ru/wix?keyword=modern+world+history+chapter+9+assessment+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391305/normal_601da07d13043.pdfIn PDF document text
    • http://lelatufepema.22web.org/r_statistical_software_books.pdfIn PDF document text
    • http://tevajevidiwa.22web.org/13270999177.pdfIn PDF document text
    • http://spindlndou.space/pigotibesitifivaririgazpuqdm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369772/normal_5ff775a6bd2cd.pdfIn PDF document text
    • http://ag-management.space/nixabikivazojifovoxuroiwnl5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xisebekixow.epizy.com/las_bienaventuranzas_explicadas.pdfIn PDF document text
    • http://zokazeza.rf.gd/39978578358.pdfIn PDF document text
    • http://fakoxogotavure.epizy.com/cargo_manifest.pdfIn PDF document text
    • http://tatasoge.epizy.com/83793624954.pdfIn PDF document text
    • http://zadiriza.rf.gd/ratomex.pdfIn PDF document text
    • http://xeregolipota.epizy.com/sijetopoluweb.pdfIn PDF document text
    • http://xiwaresijo.epizy.com/fivokazegidezupenuris.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/emulator_android_terbaik_untuk_main_pubg.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/psd_templates_for_wedding_album_free.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/93593862170.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/fatopaxatudunorurikifetal.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_off0000ca22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA22 5668 bytes
SHA-256: 2ea3ec019bbc9c2cf113546798654dd64b5eb9db3bbf5fa95101602dc3425c3e
font_01_sfnt_off0000dd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD67 9828 bytes
SHA-256: d296eb399e12f1924c19f1f7efa5ced6b883b8b98f4b99b8daea5f5f4484d135

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