Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6fa09e6eef1529f…

MALICIOUS

PDF

71.3 KB Created: 2021-10-04 06:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4095da8fea7fd935db0e318d833a7e1c SHA-1: 0462a60c5283b712830da9a939ad6cd6dc75ee07 SHA-256: c6fa09e6eef1529fcc1829bc799884176762d68096e85e708ad738219b1746be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many of which point to disposable domains or are used in link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://infrive.ru/uplcv?utm_term=be+sober+minded+bible PDF link annotation
    • http://epmresearch.org/userfiles/files/60554561351.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/sijalijedabasolinemogesu.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/717fa2fcda7a7ed001b0d56ca329a823/57366918313.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/53187801526.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/napixiwekilubaxen.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/fowurigesubidajuk.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/tipebipadobipime.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/jeragutidix.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/31755180492.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/46994854429.pdfIn PDF document text
    • https://agt.twwebmarket.com/ckfinder/userfiles/files/posepatabo.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/munobiseteton.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/pabododuxebugi.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/famatos.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/dovekoririrufoge.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109290616548593.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/pokimikinuku.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202110031915525006.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/91831470656.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/81006173812.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/kolexugisizafofuma.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/76254412178.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/27957669003.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/xatuba.pdfIn PDF document text
    • 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_off0000b231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB231 17884 bytes
SHA-256: 39d710f3f503871a17836a71f069492cb4e927f3d56bd521fa10b49196f2bef5
font_01_sfnt_off0000e03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03E 10340 bytes
SHA-256: 66267b478213534c89f07efa504f51e0dda7470bd8d021f1f2f0ed86bdcc9afe
font_02_sfnt_off0000f783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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