Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7b90437b55a7dc…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 12:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a6be2ffd209fd346ab5bf5cb2f64706e SHA-1: bfdd751a96024a2b0bd3bc50d0c4f37b42e5ac90 SHA-256: 9c7b90437b55a7dc00ab010767f201dcf2c2b92accd074b6245d7585b85c190c
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The presence of numerous external links, many pointing to PDF files on potentially disposable hosting, suggests a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malware or engaging in phishing activities.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://fueandhair.com/userfiles/files/fipidowixanelifejegabebus.pdf In PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/64767346419.pdfIn PDF document text
    • http://dominant.name/userfiles/file/metebazowamonaxovuworo.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/dedore.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/muteneperixarazibas.pdfIn PDF document text
    • http://portableandcool.com/files/files/dasogufajovebutesogum.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/67773306270.pdfIn PDF document text
    • https://profm.hu/files/file/60558999357.pdfIn PDF document text
    • https://superchills.com/userfiles/file/muzamorovusatixe.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/6178612780.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/14547526849.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/libal.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/fojopufadus.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/nopesimimebufufodizuna.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb939e4e68---rorajunoguz.pdfIn PDF document text
    • https://ekransamara.ru/files/35217006856.pdfIn PDF document text
    • http://afro-safari.com/upload/files/rixopiporiso.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/jirufulunat.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/21717562473.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/21365847858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=lightroom+version+3.5+1+apk+downloadPDF 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_off0000d3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B1 11464 bytes
SHA-256: 435b96d0163af7bb366fd2742f05cc8f75840039c8e1ca04ac32e8eae196c70f
font_01_sfnt_off0000ee94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A6 17888 bytes
SHA-256: a9dcf66dd60b6e5375c2caa91e66be11e06ba43cec3259756f00d348bb88b518

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