Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b082c4d2bcb7200…

MALICIOUS

PDF

76.5 KB Created: 2021-04-02 08:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 05640e911fcbafbfc37005e8cf3aaf77 SHA-1: c28e151b132200fc36171b369e1b7a70d10f09df SHA-256: 1b082c4d2bcb7200ced4e5cf84a9f70a33ea22600a8c67ac4e856871f03850cb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external URLs embedded within its structure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and includes a keyword related to book translations, aligning with the PDF_SEO_LINK_FARM heuristic. The primary purpose appears to be directing users to a network of external sites, likely for SEO manipulation or to host further malicious content, as indicated by the ML_NYX_PDF_MALICIOUS firing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/award?keyword=livre+anglais+avec+traduction+francais+pdf PDF link annotation
    • https://cdn.sqhk.co/kixagixupo/hjhihfm/gamokemuxapozitimuweba.pdfIn PDF document text
    • http://witomemu.scienceontheweb.net/3983848236.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381090/normal_603e83854d631.pdfIn PDF document text
    • https://cdn.sqhk.co/detokelixipi/o4b2kjO/sademulupomaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456393/normal_6012b1f5da609.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452193/normal_5fff54da7042d.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/gVibja0/97844991531.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501810/normal_5fc8a43ac1598.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/1hhMQhe/74057066960.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/boating_license_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382190/normal_5fe1246869e10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369657/normal_5fe3faf664c71.pdfIn PDF document text
    • http://xazupadapafow.mypressonline.com/4029164770.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/gdgdigI/weather_hour_by_hour_appleton_city_mo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483854/normal_604c9ec2b6a66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482018/normal_60417c68a49c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420449/normal_5fe4338a6920d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://535f918c-e50e-4760-9dbe-4b22a9cc1357.filesusr.com/ugd/65883d_80ce3992d8564502a20688aa140e51fd.pdf?index=trueIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_47dded4caf9e44e18a96fc62bac7b2f0.pdf?index=trueIn 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_off0000e925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE925 5324 bytes
SHA-256: bd5f515e8d188cdf76429e8fb42ec587e5fa654f92dd84aa52313a54b19e5dd4
font_01_sfnt_off0000fb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB60 12400 bytes
SHA-256: 621719ac243e550242eb0e2bdcce569131b924398d203d42c6f8c904be38a754

Open this report in the interactive analyzer, or submit your own file for analysis.