Malicious PDF — malware analysis report

Static analysis result for SHA-256 e09bf1613b8d0743…

MALICIOUS

PDF

76.2 KB Created: 2021-09-12 03:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 26e74cdeb38f82cd7a20c6ef946cf579 SHA-1: ac51274a403fa1124c9e57d3e14358360b7c929e SHA-256: e09bf1613b8d0743401341e909a8c8f09b88548bff36ee50f5c5df8f75b6fe67
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://laborke.ru/uplcv?utm_term=critical+thinking+a+student%27s+introduction+4th+edition PDF link annotation
    • http://braciszewska-klimek.pl/fck_files/file/81713135519.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/59709911645.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/71777467985.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/62923227162.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/94041896637.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/43323843327.pdfIn PDF document text
    • http://portableandcool.com/files/files/poliso.pdfIn PDF document text
    • https://diphong.com/uploads/85218725688.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161334e9e3842c---73105756176.pdfIn PDF document text
    • http://soc-in.com/data/media/files/31756010911.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/xemiko.pdfIn PDF document text
    • http://skolky.info/foto/images/file/mupomikopijebuwumobo.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/rowawosupesi.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/mejude.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/03/45392542904.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/nuwadasidenuvazitaw.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/94109174451.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/66557916601.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210906085601_1520924550.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/zirisukumufebisisojo.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/ratifimomekekoxafobo.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/pevesavawukumadakurazun.pdfIn PDF document text
    • https://shibbirs.com/media/files/99056202560.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_off0000c410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC410 10984 bytes
SHA-256: b6384b216ad5d275fe82f0b9af79b841bdbc79e2178ad89098d90f9d4196a5e9
font_01_sfnt_off0000dd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF585 17452 bytes
SHA-256: c933668d11ba00123fadbdf20bc2c77d083f643973a4c10cbeb8de585553ca8d

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