Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5fd5d5c7cdd94c…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 21:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: eeb32e3ff831ffa91db736535c81379f SHA-1: bab7546ec2d7cb832de63c0acd766dbab9b1b9a0 SHA-256: 9b5fd5d5c7cdd94c8ad7b7c4d6845cdaf5ea3f6e9e146d15600641cdc69d6d65
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://irlanc.ru/uplcv?utm_term=best+live+stream+sports+websites PDF link annotation
    • http://artediapharma.com/upload/files/siweluwazokunolu.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/waniradabe.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/43839913325.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/dapumazajezor.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/2606668589.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/robudimiduvawufaw.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/80058891441.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/57003107915.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/gaxurokufa.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/89174706180.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/35320841163.pdfIn PDF document text
    • http://pedraferro.com/files/files/19080122130.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/29516403313.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/22115618500.pdfIn PDF document text
    • https://pedrazzini-legal.ch/UserFiles/File/mugefamotatogak.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/kojigadine.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210915_162630.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109170528123575.pdfIn PDF document text
    • http://edituj.cz/res/file/66566859464.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/fajigunofisunu.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/49853482180.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/934c8a29ff954f8e67580c7ea91431de/66086077396.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_off0000dd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD07 17360 bytes
SHA-256: 2220611d145c2726c018df68aa14f99318afe4c7be71b8317afbb6d620683f00
font_01_sfnt_off000109fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12214 10656 bytes
SHA-256: 81b9c7470272c57ce1d8e1f90455da69baed33fb9360df5648a8007ea79e78f9

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