Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5cef7b6cac18fd…

MALICIOUS

PDF

70.7 KB Created: 2021-09-27 05:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8a90152d05802a3beed24cb11f1ab860 SHA-1: 9850cdc42124b6e24b35e38834387fd2a44245f8 SHA-256: 8a5cef7b6cac18fd2cff21f16480b77b345028780f1a2cd2de7f975f9e5b20a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URIs are consistent with a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=how+to+add+block+site+in+chrome PDF link annotation
    • http://studiocommercialedelpiano.it/userfiles/files/83320930226.pdfIn PDF document text
    • http://gespk.com/userfiles/file/miwixuteze.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/90536965026.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/daxugugerumuraxunov.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/18053265059.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/bugegitokewojivexipu.pdfIn PDF document text
    • https://gitimohammadilakhimpur.org/ckfinder/userfiles/files/31295224794.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/59232307943.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/30772562442.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16149d132eafcc---meripesebekamozube.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/relojituwa.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/24146937804.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/90239552314.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/ladivutubosemetajede.pdfIn PDF document text
    • http://talleresjpg.es/img/file/zinewez.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/29983669025.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/zefanujafuwosowa.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/rezunalijiga.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/zefivonolivorimawap.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/wuzikorovowuxajapoxig.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/todugibisakavaba.pdfIn PDF document text
    • http://lex.tj/img/file/40764134009.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/xawapimomejoresukujobupow.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/38899251004.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/93262937694.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_off0000b33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33A 16224 bytes
SHA-256: e8817d9bb700d23b0fc3ae0f3409127fbf139edc5ab2b0a118dda3bb484cfa9c
font_01_sfnt_off0000dc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC13 10944 bytes
SHA-256: a922c494add434c117beedb4acb82603ce9434e8ce9fcf1b37239df03c77e7d6
font_02_sfnt_off0000f53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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