Malicious PDF — malware analysis report

Static analysis result for SHA-256 a447df1453d3c191…

MALICIOUS

PDF

76.7 KB Created: 2021-09-19 15:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fd6c2e80dffaef5c3bf22fa9b76fc602 SHA-1: e8faf4348a14bf92a68cc7ed3ab2f6347e495209 SHA-256: a447df1453d3c191671aa28d612202929ad8ba958f804615e684dd7ebd472e32
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external URLs, coupled with ClamAV detection as 'Pdf.Phishing.Trojan', strongly indicates a malicious intent. The JavaScript likely facilitates the redirection to malicious sites or the download of additional malware. The numerous URLs suggest a link farm or phishing campaign designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=the+lies+of+locke+lamora+read+online PDF link annotation
    • http://daearesort.com/FileData/ckfinder/files/20210909_E72057B44E1972E3.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/18042651787.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/76146659963.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/78771401184.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/tuzaditalanakufefeg.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/14092321389.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/46157156218.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/kabugulupugorodujuxa.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuzofinebalivekivanarodep.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/60763780891.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/7975110323.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/vomifekoduvewagex.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/fodope.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/pasasenuxogugudojudelev.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/76144440942.pdfIn PDF document text
    • https://subarini.ro/mm/file/85727040375.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/vigotupejuziginubexomax.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/pemetegidoxapava.pdfIn PDF document text
    • http://xhzhengli.com/upload/61604090114.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/27382789571.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145fc68ad6f1---gumakanoxupobuw.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/lusuluxozoxonudarovuwame.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_off0000c71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71B 10696 bytes
SHA-256: 806bd68de1dab602684379d417351624fe5eac312f6b15d5bcb2cab87460d36d
font_01_sfnt_off0000df6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6D 17716 bytes
SHA-256: 0a3df8de9ac104f0efccbe0f2c16be56a658ae3c586efe8c8f797175048c9e0e
font_02_sfnt_off00010d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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