Malicious PDF — malware analysis report

Static analysis result for SHA-256 2135ce2f39a6e2ff…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 22:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6027e3a5d5fe86b5bd3b1a1b2fc1b314 SHA-1: c8a4566fddbd8bc0f6937b5676b848e4df642a8a SHA-256: 2135ce2f39a6e2ff816cb39d4c34d9a57be89bed4d2c4bbfa25c00710e6f2574
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 pointing to various domains, suggesting a link farm designed to redirect users to potentially malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a tactic to obscure the final destination. No scripts were extracted, but the presence of many external URIs points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/uplcv?utm_term=top+10+pokemon+games+gba PDF link annotation
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161452563ab071---tamofefika.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/mifetawuzirularoboxejit.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/68172525720.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109061405418919.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/dugiribavefazanosibit.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210912065401.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/zizidapakekekupunux.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/4935934875.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/xedusiwofetonazavuvixiliw.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/41382517288.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/44949006634.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161486c135d42a---48129037333.pdfIn PDF document text
    • https://kokomanis.com/contents/files/13996160450.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/81059239093.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/suzufixanaperegekakixa.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/52246264779.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/30623278733.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/99178873782.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/liwomivilenonanebifewu.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/wulonetabevap.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/96683409766.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_off0000e101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE101 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 18612 bytes
SHA-256: 9894a28c5c8f0c5c4a92325db1c179eef09df7290f7df432d956d6e36c06df8f
font_02_sfnt_off0001299a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299A 10628 bytes
SHA-256: 43d454cd1df424fc0b9d65551fb1f0c35c3422f819a0dd0c2bc9d5c6c5bc1b18

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