Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd17f022eceefd3e…

MALICIOUS

PDF

87.2 KB Created: 2021-02-23 02:31:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d97820b2a9267b731407af0617d8a2cb SHA-1: d74187caca2617df42402d43929d417f6d6af20d SHA-256: cd17f022eceefd3e4590645a7987c7bdb39368f42c9ec480cb0a34a8e048ab11
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 flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though partially garbled, appears to be a lure related to a book summary, likely to mask the malicious intent of the embedded links.

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://leonvi.ru/123?utm_term=cien+a%25C3%25B1os+de+soledad+resumen+por+paginas PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374957/normal_5ff9087db8c54.pdfIn PDF document text
    • http://gratoram.site/xamidomatapobusavioajki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403556/normal_600e292d5b2d4.pdfIn PDF document text
    • http://dirtygirl.fun/190347969940aqm9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366982/normal_6001e4c57df73.pdfIn PDF document text
    • http://damvglaz1.xyz/part_of_speech_worksheet_for_grade_4is82p.pdfIn PDF document text
    • http://rukozhop-guide.com/advanced_excel_2013_notesb3ktl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369518/normal_5fccd87e30159.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/pib9jcN/60479427647.pdfIn PDF document text
    • http://megahit.space/532374493777g6ia.pdfIn PDF document text
    • http://goodik.fun/44985525464ya9fk.pdfIn PDF document text
    • http://hihikane.space/659576347265zh2z.pdfIn PDF document text
    • http://uber-global.com/16183522009p8qeg.pdfIn PDF document text
    • http://sewonmedix.ru/931803372624mgtu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491433/normal_602bdddf9480d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00011662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11662 5396 bytes
SHA-256: a5ee42cb8da790640e859af218ff6d4836dcb2e6abad4f797541f07a658e7c41
font_01_sfnt_off00012860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12860 11460 bytes
SHA-256: da21a64ae8db1d6cca49465537422d400d17ddc9f8dfe469c7bedfbd1bf90bf3

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