Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f26bbe17105719…

MALICIOUS

PDF

83.9 KB Created: 2021-03-18 21:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69bf156ff60491814db2ffd22512f595 SHA-1: 959326f492f162cccbe7df7123ab583c791c2617 SHA-256: 35f26bbe171057191ab255146196c84affe4aae588ad0d0a47d4f9fe602c7198
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or direct users to malicious content. The primary URL, 'https://kuzutuzo.ru/wix?keyword=365+dni+movie+watch+online+free+english+subtitles', further supports this by mimicking a search query for popular content. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/wix?keyword=365+dni+movie+watch+online+free+english+subtitles
    • https://tekevifumufov.weebly.com/uploads/1/3/0/7/130739519/wolipojafisi.pdf
    • https://cdn-cms.f-static.net/uploads/4496811/normal_605012331c2c2.pdf
    • https://static.s123-cdn-static.com/uploads/4393639/normal_5ff917f13716f.pdf
    • http://tamabobusu.22web.org/answer_key.pdf
    • https://sabalijazot.weebly.com/uploads/1/3/2/6/132695986/2982349.pdf
    • https://suxugugufagiwa.weebly.com/uploads/1/3/4/7/134740592/fidikizoni-tezewamefotina.pdf
    • https://matomuzunoto.weebly.com/uploads/1/3/5/3/135389802/47407dbd9e.pdf
    • https://cdn.sqhk.co/kekelivig/8jb1H7g/dragon_golf_course_las_vegas.pdf
    • https://cdn.sqhk.co/fudamozomeb/4hehhpd/electrical_symbols_and_meanings.pdf
    • https://cdn.sqhk.co/wubofuse/e1gejd5/58258959655.pdf
    • https://cdn-cms.f-static.net/uploads/4478127/normal_601f673aa02df.pdf
    • https://static.s123-cdn-static.com/uploads/4380379/normal_5fff11b55e90e.pdf
    • https://jubolovewo.weebly.com/uploads/1/3/1/4/131453214/gebewuxu.pdf
    • https://cdn.sqhk.co/modajili/K0Hgd5z/penunolapabafewe.pdf
    • https://static.s123-cdn-static.com/uploads/4373505/normal_5ff6acd2a9ea0.pdf
    • https://cdn.sqhk.co/surofowudula/Kb1ifHu/spin_warriors_istanbul_mod_apk_unlimited_money_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_459e2f65532442f1b1a351dad3c22cbf.pdf?index=true
    • http://guturiwukazog.rf.gd/98843809140.pdf
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_39fea07a7abf4464a5082435fc2f8adc.pdf?index=true
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_015135e14b454672a9d6c14104881708.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecf2.bin
04623033b86d68ca28ce9e7641a235097284a0528fb47e69ad32ad218a493393		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 6072 bytes
font_01_sfnt_off00010187.bin
540986bf62d015e68df45504fad203451068ee22755f9618d584e417c7dd56e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10187 11476 bytes
font_02_sfnt_off00012868.bin
0c371f8df579e47e3eaa83da424e5d0dddd767e84e7daa2b8243fb53349cf396		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12868 16712 bytes

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