Malicious PDF — malware analysis report

Static analysis result for SHA-256 29455781b14e064d…

MALICIOUS

PDF

77.4 KB Created: 2021-09-19 12:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6c5a8b0a648a6557b035bdf4e5daf5eb SHA-1: 195af6972fdcccc184c50f79ae964c06bd1c0305 SHA-256: 29455781b14e064d2bbf4a8efee3e31bf59aed04c17b9b1eef54411e475f4131
134 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 pointing to external sites, suggesting it acts as a downloader or redirects users to phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a link farm designed to distribute traffic to various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://inwebjor.ru/uplcv?utm_term=logout+google+maps+android PDF link annotation
    • https://iasvn.org/Images_upload/files/todidebe.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/gadojipekikafolidatilu.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/jikuluwosemol.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/baleziporenuzagas.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/65748382948.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/21070528373.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/paxesabujojikala.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/83570840326.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/64730760898.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/fejegitamerivevilij.pdfIn PDF document text
    • https://kratky.eu/files/file/rulanudixoto.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/86265588311.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/sejinaxe.pdfIn PDF document text
    • https://alev.az/userfiles/file/42236801627.pdfIn PDF document text
    • http://gazetavk.ru/img/file/30526010563.pdfIn PDF document text
    • http://sbairs.com/datas/files/noxigafo.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/86196762444.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/vonuvoji.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/25278945581.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/fasotameta.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/mapuzuronojirakexo.pdfIn PDF document text
    • https://medius.sk/userfiles/file/jokutovekajukapego.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/91438195144.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109050927301060.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/vadenipini.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/24378834563.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_off0000cc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43D 10792 bytes
SHA-256: c547fb1eb5e39be7da928456bcb30a74661b05a190860e3cc89b2c8ed6a75345
font_02_sfnt_off0000fcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD4 16624 bytes
SHA-256: dc4459dbb7b245e0c3a8dfdc62211d6f76998daacfa5169a5e41092bed8f579f