Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbcc9af82bc5c69e…

MALICIOUS

PDF

74.0 KB Created: 2021-02-14 08:52:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4d94efaeefe4d11f662b711fd4e29171 SHA-1: c09074e036f70e0c993052f1868a98e105ad9eda SHA-256: dbcc9af82bc5c69e09c7c122745c2532feeef35c798b44ee471fe5038aaa975e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious domains. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. The presence of embedded URLs and the link farm heuristic strongly suggest this document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

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://druttle.ru/wix?keyword=saki+kavouniaris+daughter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4529149/normal_600cfc1617690.pdfIn PDF document text
    • https://cdn.sqhk.co/wareberefiz/djeSjg4/metropolitan_theatres_goleta.pdfIn PDF document text
    • http://fipoziwebetaz.22web.org/filter_by_cell_color_in_google_sheets.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/Siijhtv/55247165123.pdfIn PDF document text
    • http://springwin.space/4556548123099gvu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481667/normal_5fd0859facab5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477630/normal_60036f1128d47.pdfIn PDF document text
    • http://tryraisins.club/appeals_to_ethos_pathos_and_logos_worksheet6b20k.pdfIn PDF document text
    • http://sizikigaraju.22web.org/weather_report_delhi_airport.pdfIn PDF document text
    • http://natur-green.fun/851275293340dgn5.pdfIn PDF document text
    • http://iranianvc.com/calling_your_spirit_guideswfxi9.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/bikikonifilorunovaxipaku.pdfIn PDF document text
    • http://jekowatu.epizy.com/27881240440.pdfIn PDF document text
    • http://vufobaratoja.epizy.com/3304194767.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/91350409845.pdfIn PDF document text
    • http://dapijapixezido.rf.gd/32890612177.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_off0000e695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE695 5284 bytes
SHA-256: 5b0699790dabe1ee40c9d45c98cfb83faf6f7f08f65516fc5e62317cf73d5ed5
font_01_sfnt_off0000f88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88E 10128 bytes
SHA-256: d2d1f3a9904252456d311e19b759b77720528108f3d5672f5d55ce5b6ce99fe2

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