Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42463086531a454…

MALICIOUS

PDF

78.5 KB Created: 2021-09-18 03:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3cc42a4b98f414a2606f4afd0e567ee6 SHA-1: a9b31cdbed3accdf08f99507adefdfbc63a02878 SHA-256: a42463086531a454e4c165648f3842b719b4734f8b0e3821d2ab21da05eae434
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and form a link farm, suggesting an attempt to obscure the final destination or distribute malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs indicate a potential for malicious redirection or exploitation.

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://cantarefides.ro/admin/userfiles/file/87007288510.pdf In PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/86229655072.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/zadutunubizesoteved.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/xurawesu.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/fekudasadotumut.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/giginijuwitu.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109152221162668.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/vimaradevesumewadofovonax.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/qbln9h4pui8j00dblcsgvcm8q7/malobimemegibopazu.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134a9629ca53---jires.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/69769811815.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/28678093001.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/xuvoruzegor.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/ximen.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/zadupaxaporaloniwibetuv.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/47322221603.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/difegomufuj.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/69561241046.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/69396092115.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/pomozuxef.pdfIn PDF document text
    • https://netpage.info/userfiles/file/goxebamadoxuzutajoturesop.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/35699254536.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/92689385488.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/kekepopevetiwafi.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210906080653980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=latest+wallpaper+hd+download+for+android+mobilePDF 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_off0000ced1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED1 17156 bytes
SHA-256: e64c91af68e374a5279595e2d46f8ee68e8cc3df4b08b01ffcd9280f1269d375
font_01_sfnt_off0000faf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001130f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130F 10944 bytes
SHA-256: 34941da22f0919150d0beeebb41c3c96691f27a97bd9eeac37ae638ade3d5da1