Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef86fda3cb07bf14…

MALICIOUS

PDF

80.0 KB Created: 2021-10-10 12:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b10daced2738d30390e8bae5b6178124 SHA-1: 059331590331ffe3c810324d9829c07a2c28fb70 SHA-256: ef86fda3cb07bf14129740c3bc648038d59f04f9ff9f90baf5f5e9486f19e0a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users through multiple sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://fivetc.net/uploads/files/94108188776.pdf In PDF document text
    • https://dalton-english.com/userfiles/file/23631737242.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/80579138748.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/sazagiwasewutenijuzawu.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/69801959526.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630691243.pdfIn PDF document text
    • http://cataga.de/beta/files/file/juwisaxaxomi.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/zifis.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/nidozalowopokidoxa.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/losuzugivalu.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/nupimevuduj.pdfIn PDF document text
    • https://majubesar.net/contents/files/lomuvufododigorizaz.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/41177559085.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/23888015707.pdfIn PDF document text
    • https://dcimx.com/files/85859951200.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/38273854593.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/38148877875.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/leberifogupazuvexagatif.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/zejinafirola.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/12467905427.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/zutupoxupefixipuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=10.3+1.2+packet+tracer+answersPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD234 10720 bytes
SHA-256: 492a492ac24de8c0f1067e8c6828d3be3b37e7b148d22a87e7720c9ff42639bc
font_01_sfnt_off0000eb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB29 18412 bytes
SHA-256: 63ec9aa37a16005f7f27c33f2f152b228064533a0c5698606915ef720020bddc
font_02_sfnt_off00011a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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