Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26d98dd2c12f662…

MALICIOUS

PDF

89.1 KB Created: 2021-09-21 09:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 39a7ec23d0e3a49a0f80963b5c4c4d42 SHA-1: de35288a992ac63484646ad8ad2aa3f0ce660089 SHA-256: f26d98dd2c12f6629208aea8fb7e5035c389a1724c1151d1abc1ebe0d9184a89
154 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The PDF also contains numerous external URIs, including one pointing to a raw IP address, indicating a likely attempt to lead the user to malicious content or phishing pages. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://sushigonewildtogo.com/uploads/files/25153255268.pdf In PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144aea571436---7731519671.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/65058418123.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3f7216da5a1b2ffd7f2c110a1afa90fd/3259165646.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/61029769576.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/37741671598.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/masuxulevudefezoroluz.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/jaketozimiziworamifa.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/36039593776.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/fapuwepexuwoxokitipefil.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/40238471558.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/tekixulaxugom.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/43831888456.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/xojuwulox.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/luvukekarirodefujaf.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/wokukafofuvelajedigow.pdfIn PDF document text
    • http://ranch.pl/files/file/pubojibetolaji.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/62781571697.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/fuzujevuti.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/radurenukanesukijazukaf.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/41759503128.pdfPDF link annotation
    • http://thegoshow.net/userfiles/file/mesipekawepexudosamer.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/mudawewemelogolosojuje.pdfIn PDF document text
    • http://stl-hk.net/userfiles/49194668365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=nayattu+malayalam+full+movie+online+watchPDF 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_off0000f8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 17724 bytes
SHA-256: a7000e137464eabde643aa0cec4acc2afe937c4d49ff6340175661e179ed64c0
font_01_sfnt_off00012615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12615 10676 bytes
SHA-256: 8c9bc30bee293c074a1bea052e71efa12ba07ad633cbec8c526d8a05478294b1
font_02_sfnt_off00013e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1