Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4f963e04c104d0…

MALICIOUS

PDF

74.6 KB Created: 2021-09-22 10:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ec26352caec5b001146bb58c18add151 SHA-1: dd9c17c15c20175991383c7a22f7da265fd6cc6a SHA-256: 4d4f963e04c104d091e6b5aec5be83c1f9adb2ff424eaf483ae1da188517e5c7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, with numerous external URLs pointing to potentially malicious content, and a 'download button' lure. The PDF's structure and numerous external links suggest it is designed to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=transfer+data+android+to+android PDF link annotation
    • https://kanat.com/upload/ckfinder/files/lugewimalatodawaxenexo.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/56582353193.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/2018939950.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/viwej.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/jitasagojifuvuxibet.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/liwixava.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/vevele.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/xufeletuz.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/12865176004.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/mokitujekogi.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/sejolabaverujonop.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161491fb983cd3---65386298649.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/5051511801.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/rebekatezid.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/gasumubujisodedimon.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/xumobigojoxoderaxudoref.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/resefudumevakixefadozapon.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/xiropetemojek.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/suxusapedep.pdfIn PDF document text
    • https://rosycaffe.com/file/16311603297.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/50119867978.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/2d3dfae83f3204f8feb7fb98623d0ab6/noliputibiwaduz.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/nifamirevutujimolupoxipuk.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/zogagup.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/ziwerukomozanusadog.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_off0000c2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B5 16704 bytes
SHA-256: e25d0fd6b7cbcdfc0cf41fbd373fe39d2a8f15673f60b55fbf7bfc6b102cdf71
font_01_sfnt_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 10264 bytes
SHA-256: d44b06d4293ecef8bb0b0312d21a02569cc72a69cda91b5db41fdeb6b37e4f15