Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb98b1cedafddde…

MALICIOUS

PDF

71.8 KB Created: 2021-02-11 23:46:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 91869ce7e0421ba1e685abc355aecc31 SHA-1: 1f2ff39ef3cb362021a904d0f42404dd37be96f8 SHA-256: bcb98b1cedafddde3973512da4a2d1b589665b202868140531bfc5335583eba5
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, which is likely intended to redirect the user to a malicious site. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external links suggests a link farm or phishing attempt. No scripts were extracted, but the overall structure and embedded URI indicate a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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/wix?keyword=baby+shark+pdf+piano PDF link annotation
    • https://cdn.sqhk.co/woxutonezem/z8ibjay/amc_plus_free_trial_roku.pdfIn PDF document text
    • https://cdn.sqhk.co/rosomugimo/ji4hi1i/damas_checkers_descargar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488323/normal_60095a0612ccd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446161/normal_5fe00cabd84de.pdfIn PDF document text
    • http://muwusus.iblogger.org/nielsen_report_sustainability.pdfIn PDF document text
    • https://cdn.sqhk.co/nugopanage/jj9iigg/nba_hoops_basketball_arcade_game.pdfIn PDF document text
    • https://cdn.sqhk.co/nesadatifu/dwHhabl/36753078511.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/lonemesojur.pdfIn PDF document text
    • http://godutiliwaganos.rf.gd/fixusajulojodulawe.pdfIn PDF document text
    • http://fawamoru.rf.gd/rovojowidokimixa.pdfIn PDF document text
    • http://xibubew.epizy.com/voluntary_acknowledgement_of_paternity_form_maryland.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/96235625610.pdfIn PDF document text
    • http://turegipamikum.epizy.com/inset_map_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/formation_bafa_afocal_evreux.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_off0000dc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC02 5452 bytes
SHA-256: 7a806d841293c0ae5595d9a868e1aa656bde57ea342dd52bb1754d2650fd3fdc
font_01_sfnt_off0000ee85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 10600 bytes
SHA-256: 41dbfad0c9779f44aa941a6e785d5fb431eedae14229806a77ef72457d998e0a

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