Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e28ce95b724e0d…

MALICIOUS

PDF

77.5 KB Created: 2021-09-08 19:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b36e661dd398e723f1cd3142409ba6d6 SHA-1: 9083096304d67e245aab0f3f36868cd8cbe79bd0 SHA-256: 40e28ce95b724e0dd8826ba241195b8caa1cea3693d2f688782352e038cd184b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in link farms, suggesting a phishing or redirection scheme. The presence of external URIs and the overall structure indicate the PDF is intended to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://philabc.ru/uplcv?utm_term=plural+words+ending+in+s+and+es+worksheets PDF link annotation
    • http://reopen911.info/media/file/53245923334.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210908062910-80771172015.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45958661481.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210904131941425247glvmng4793ea.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613149b1df541---dinobap.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/vuvofamulor.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/vetifonopurubejitanula.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/13008412817.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109072256479947.pdfIn PDF document text
    • https://slide-bearing.com/d/files/wedoxadurunowifojoxute.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/47972449862.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/riketubuwowudure.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/78328754624.pdfIn PDF document text
    • http://amandamaitland.com/images/file/79522374206.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210906151844.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613020e23f5e2---sisepematonolubozix.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/50939057829.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/59443613043.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/nitemokiguvojevig.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/muwiwujipomuravexupalonud.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/pupevajobibosiwanunimu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDA 10808 bytes
SHA-256: 473441bf3e548c5d5af149e3e6b9e50902bae95c0c4dd9fcf8ae3884b63d1ca8
font_02_sfnt_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 18748 bytes
SHA-256: 6893a188e65932144bee1d53ae20ae8d04a7bfc6405baa9a559978a7bef18ba5

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