Malicious PDF — malware analysis report

Static analysis result for SHA-256 68085ca71ca98bb3…

MALICIOUS

PDF

72.1 KB Created: 2021-09-19 20:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 90f4ff48d73441e8a7222ad687ae702d SHA-1: b712c995b4b87d2786f1c65defd8a4d96c907921 SHA-256: 68085ca71ca98bb39f5ebddc68b5725f9a3c03dceadc8147b81d1d98fb94d0dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to PDF files on various domains, indicating a link farm designed to host malicious content or redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://searchlink.org/userfiles/file/70403629217.pdf In PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/78062110513.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/97057507358.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161377b9b10cfb---wonukiwatenafegosaxa.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/doseguwefupuwen.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/dawotabekozutuxitobug.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/31487947300.pdfIn PDF document text
    • http://veitali.com/upload/files/powamonavopekuted.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/47375919386.pdfIn PDF document text
    • http://360global.ca/userfiles/file/16128785507.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/lapejogefukubob.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/66352410115.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/6684126766.pdfIn PDF document text
    • https://5udua.com/contents/files/85875878869.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/50481197040.pdfIn PDF document text
    • https://mar3ol.com/Files/files/86567472694.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210919001614.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300a77c22a4---7603340120.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/50039493712.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/86281412508.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/fokitelume.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/73489298336.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/10334552979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=jeet+boss+full+moviePDF link annotation
    • 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_off0000b94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD164 10308 bytes
SHA-256: 7f39caec4726c4d33f408fc794eee6ef91b138085bb5c47e5d8bd2d530e75451
font_02_sfnt_off0000e8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AD 16136 bytes
SHA-256: ef11610c0f77d5359025a1b6cfc0806cec46b9142f1699d6c97c11b86979b612

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