Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6303bbe850449e…

MALICIOUS

PDF

118.0 KB Created: 2020-11-24 05:47:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c24e5a101eaf0133b6306f47124301d7 SHA-1: 17fa463a6ca6d20b1c909147b91ba315d26d7a5e SHA-256: dc6303bbe850449ee2069d8f202057dae278660219e9b7018ba018f8787cbef5
156 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The PDF contains a large number of external links, indicating a link farm designed to redirect users to potentially malicious sites. One of the primary URLs observed is https://trafftec.ru/strik, which is likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/strik?utm_term=%25D8%25A7%25D9%2584%25D8%25AA%25D8%25AD%25D9%2583%25D9%2585+%25D8%25B9%25D9%2586+%25D8%25A8%25D8%25B9%25D8%25AF+%25D9%2584%25D8%25B9%25D8%25B1%25D8%25B6+%25D8%25A7%25D9%2584%25D8%25B4%25D8%25B1%25D8%25A7%25D8%25A6%25D8%25AD+%25D8%25A7%25D9%2584%25D8%25AD%25D8%25A7%25D8%25B3%25D9%2588%25D8%25A8%25D9%258A%25D8%25A9
    • https://cdn-cms.f-static.net/uploads/4414502/normal_5f973f50aa7bd.pdf
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/3658ca80.pdf
    • https://xasugalepo.weebly.com/uploads/1/3/4/3/134311154/800d91b79fa382.pdf
    • https://loxigiberojawi.weebly.com/uploads/1/3/4/7/134770663/9645ad1e594e7.pdf
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5f88afa696f35.pdf
    • https://cdn-cms.f-static.net/uploads/4373243/normal_5faf525b9c38c.pdf
    • https://jazejuvo.weebly.com/uploads/1/3/4/4/134439384/zanawamojidutuk_wimudar_valojujuroj.pdf
    • https://cdn-cms.f-static.net/uploads/4406168/normal_5f91d241804bd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bokexizometun/blood_and_iron_speech_def.pdf
    • https://s3.amazonaws.com/bopuxosavubare/34965258058.pdf
    • https://s3.amazonaws.com/tobobowu/bebipevukadawijegiz.pdf
    • https://s3.amazonaws.com/donake/electronics_book_free_download_in_urdu.pdf
    • https://s3.amazonaws.com/fuwenoxuzasila/stargirl_dvd_release_date.pdf
    • https://s3.amazonaws.com/firudegix/kailua_beach_surf_report.pdf
    • https://s3.amazonaws.com/nosepevozux/43319991309.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00018eb9.bin
8bea7c84a5adaf17fcd46c9b9bd47ec485b153dbd161a95a3bccdcc60aebbf8a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18EB9 32248 bytes
font_00_sfnt_off00014019.bin
8820af67dab28461c3733bdaa7b331925867dfa18397ddf4c112174cc962db1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14019 4068 bytes
font_01_sfnt_off00014df8.bin
b2d9722225425ab658a9823c7988d54152d38132bb2e7e392f533c3e54e034d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14DF8 10084 bytes
font_02_sfnt_off000170dd.bin
05482df580de400ae658e8a73cf9593197885a0eb8b90a1d0da08550d1cc395b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x170DD 18700 bytes

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