Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b178831c9888d4…

MALICIOUS

PDF

83.4 KB Created: 2021-09-11 12:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 658b44fa4c036dfdbbf60a9f263d5726 SHA-1: 86ea49ee5dd1d1e671793a46d8aab87ede33fcf1 SHA-256: c0b178831c9888d47162f90f6b629ec11b5755968883f914bb0cd6cb0f63476d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or malware distribution attempt. The presence of external URIs and the overall structure indicate an effort to redirect users to malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=frp+bypass+tool+download+free PDF link annotation
    • http://gidaero.com/upload/fckeditor/file/voxenurozubixomewas.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/34362080576.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/tijefajupitokepamipu.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/62890020868.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/73900443096.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/14021414101.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/26656437408.pdfIn PDF document text
    • http://benly-carson.com/product/files/foludixiduxokopogumes.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/xofubakalefepifuvamawis.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210905_DDF3D1994CB7492D.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210908060816.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/vitorulode.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/rumemowomojomitupomopekup.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/jenibagojesugukusamizadub.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/juvitokejetili.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/lexigugigejezixawixemotod.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/44711110823.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/87342271884.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/34944149808.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133ebad2e286---28464738686.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/falobomagatazesimoluguwe.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/nenugamojikefewagutokiwu.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/75078684652.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/78124539508.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613499dd67791---39095199009.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_off0000e0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AA 17940 bytes
SHA-256: de36e6815e207739bac67caf5a5bc02119f96dca3b0515919c2a7d9fa29f1adc
font_01_sfnt_off00010f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001272b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272B 10716 bytes
SHA-256: 77db985cea2aabc15c1264c5a12dbe7587ec341d341a3b10eb69e24f175f5c0d