Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43947743d522e84…

MALICIOUS

PDF

80.2 KB Created: 2021-09-13 23:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe7ea806250bffa65f7655f06a9cc99e SHA-1: 3306f65a043933b2e89c2d6f7bf51638f8eaafbc SHA-256: a43947743d522e849194c927bd94da8f9a63feb044cc0649e8a509442e1753b5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The presence of a 'download button' heuristic further supports the phishing lure attack pattern. Although no scripts were explicitly extracted, the nature of the PDF and the associated URLs suggest it is designed to exploit vulnerabilities or trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=config+free+fire+skin+apk PDF link annotation
    • http://gbfrjournal.org/pds/userfiles/files/82552954477.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/sawaxofoxuwidon.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/rijuwises.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/10382199248.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/veraraxuxawubeka.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210904093831.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/60184568194.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/41643642040.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136c96133af3---tenixi.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/52710067867.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/sesesavilodo.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/bewiruzir.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/93629250656.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/94146407495.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/tosowunabigi.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/30331598699.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/waguwor.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/nanerodema.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/jelitogilojifuxinef.pdfIn PDF document text
    • https://italvaping.com/file/babibukasuxas.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://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_off0000d68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9F 17324 bytes
SHA-256: fcb02b68e37007f2282d9f39c04fc4aaaacf96ab181c610e013105514831d95a
font_02_sfnt_off00011b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B23 10512 bytes
SHA-256: 4ee6bb98b9ce3b9a35593b308e9a9cc0744b0e46f0a9771ff6da1df23c9dca3f

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