Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ba9b452adc84ca1…

MALICIOUS

PDF

79.9 KB Created: 2021-09-22 14:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6e9773b11ce9a39d0eb84fb808292171 SHA-1: 7d9edc09dfccc68f6c45d9a322d555ef012a4cf1 SHA-256: 2ba9b452adc84ca1867bc971d78c8864bc7e56ae406441ec7ad777f5390cb92f
134 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm on disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the execution of malicious code or redirection to malicious sites, aligning with T1059.007. The overall pattern points to a phishing attempt via a malicious attachment (T1566.001) potentially leading to client execution exploits (T1203).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cameradungphat.com/uploads/files/11295471325.pdf In PDF document text
    • https://santa.sg/images/users/00000000/files/filodetolok.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/66001109252.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/givifu.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/32678307164.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/65721324546.pdfIn PDF document text
    • http://i-physiology.ru/upload/mupomakefebet.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/zatugulawupide.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/3259377121.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/98224409369.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/36234924832.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/d6f2051d8aaf897c4a4791e27ce674ae/pemugaxofatoxavanuriso.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/95365900058.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/25756350372.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/velolowomolo.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/30097293168.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/vuzariritotapubi.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/58255217259.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/nojalajojebufetakeke.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/57106597728.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/70609022036.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/23449374928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=wallpaper+hd+hacker+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_off0000d62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE44 10428 bytes
SHA-256: 2c94f010e0dcc09d4da2189010a416be60dfb34c70126ab05c0deaf3297d60ce
font_02_sfnt_off000105c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C3 17052 bytes
SHA-256: 84309f6990b6664a85d8b6be6295a208019157c20ccb37618737cb3be07de248

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