Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea4942978445e50…

MALICIOUS

PDF

85.9 KB Created: 2021-09-12 18:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 93129b003f504d0547817e46045c6cbc SHA-1: 7b262cb969f58eba9ced63dd8f74b86e1d07f41d SHA-256: 4ea4942978445e50c30e7e08f10c6b90b4d2309148964312221fde00519d0c07
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous external links, many pointing to suspicious domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links on disposable hosting, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://benedictinoselrosal.org/ckfinder/userfiles/files/pulotaxilaven.pdf In PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161368a3b98f22---30480521302.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/zetexexupigasidixexiw.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/boterukidaleramopa.pdfIn PDF document text
    • http://snsi.jp/image/news_file/leliburunekusilokigulas.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///88840067820.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/99834532535.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/modod.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/wazexad.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/tunefuravofasuwowofezez.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109011648433390.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/08/pegesuvujawupanopud.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/minebuxopajajibosofezu.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/25414227389.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/78165759966.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/dupomixoxurevazuxip.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/xaludusewumabutemidas.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/51081605041.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/nakasinam.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/86125379812.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/91173219446.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/levejoxovuparizuw.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/rubotojojobefa.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/5303854650.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+grand+tour+a+massive+hunt+full+episode+free+onlinePDF 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_off0000e79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79D 18608 bytes
SHA-256: c2ef081270a0cf95a325b5ce2366e7aaafd54f3c9b2f8b2eb10cfe8b37d030b6
font_01_sfnt_off00011820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11820 11076 bytes
SHA-256: 7e8345204717b6805feb4d90faa23a1287150cd3bf47248d5b500a0ad25bf196
font_02_sfnt_off0001318e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1