Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f5a77ca168d68c…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 03:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b6a888fd45bc6546d3e36fb7ac44c50e SHA-1: 6cfc618c8cd70cd7a0dbd64ad25f84043796712e SHA-256: 84f5a77ca168d68c2b1983b04ddd65c7a3bec3d8ebbbab6a8f295c4a6e4829a8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for executing malicious actions or redirecting the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://aljazeerahpetroleum.ae/userfiles/files/24266736122.pdf In PDF document text
    • http://aucoindeshalles.com/menu/file/lumogo.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/12681510629.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/11352089152.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/86156629006.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/nozozererilel.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/kofufafazotokexivinodado.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/23459895954.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/38841998584.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/19484287087.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/15750346725.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210924185112_gpuhf7.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/98885270006.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/xobuxubaruz.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/49663501346.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/62364951953.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/17278804187.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/36867520919.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/fiwuzawivadipixonuxaviv.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/948ffc86f704a215abab06def1d926b2/44979464793.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/43040753577.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/13284092669.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/59083935265.pdfIn PDF document text
    • http://centronegozi.com/public/77063908333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=lost+dir+sd+card+androidPDF 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_off0000b182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB182 17344 bytes
SHA-256: 3a3e20f2925109ebd732fa26d3cb6cd23f491dff6fbcd9ce872228197a67dba3
font_01_sfnt_off0000ddac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAC 10144 bytes
SHA-256: aa48dfa126eff592a3429d6194c98b0a54704af6af55d06f542171b2f05140dd
font_02_sfnt_off0000f474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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