Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad70a776b83356db…

MALICIOUS

PDF

78.8 KB Created: 2021-09-22 16:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e9a1aebc6093b89511b49258c9bc7d4 SHA-1: 257b9be18790cbe5f5c6db78e1c04a3754481728 SHA-256: ad70a776b83356db7ae075f9ba4f318e9020fd49cd6dd7caed537793e1bc5b20
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a tactic to obscure the ultimate destination or distribute malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to create a deceptive link structure.

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 http://greenld.com/userfiles/zomazagogonaruga.pdf In PDF document text
    • http://susasoft.com/upload/userfiles/files/7135639344.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/rojafad.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/zanexonejusenadasut.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/121908488672.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/gosogofoku.pdfIn PDF document text
    • http://net-work.cz/data/file/begowosurejematulan.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210902100152.pdfIn PDF document text
    • http://evola.it/userfiles/files/93809472152.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/nidimebimo.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/patipiteliwivijigonuboz.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/javameruvapexokotibu.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/65422923231.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/lasoxuzogipawot.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/25728457161.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/96926643637.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/49473379025.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389d264fa64---97053141364.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/17383686605.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/f4dc24e47f9138cf5512c350180db066/rusufujujivewajez.pdfIn PDF document text
    • https://artemishosp-em.tw/uploads/files/202109201527191821.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/bajanumazeje.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/76478459404.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/sawibupanijupabiw.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/33581881338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=car+mechanic+simulator+download+androidPDF 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_off0000d03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 16908 bytes
SHA-256: 34575650cf7a854e960cb7675317f71da66b2551cab432e7394084c92f091338
font_02_sfnt_off000113d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D5 10852 bytes
SHA-256: b071c7816ca2a18bacab3032f66578ad68672efade44587f3f1e408519a61604