Malicious PDF — malware analysis report

Static analysis result for SHA-256 01865b41911e61cd…

MALICIOUS

PDF

67.5 KB Created: 2021-09-28 21:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 64fe39aa71374819dad8f816fbd4e6be SHA-1: eddb16ea16eaf6e734b46801ed65a1501e5e58b2 SHA-256: 01865b41911e61cdfa86c60b9e257acd5f39511734d81fcdb3fc613cb091dc89
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, indicating a phishing or scam attempt. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://www.somdattabasu.com/fckimages/file/83724817324.pdf In PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/lovenusafe.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/vobepasamodegabu.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/kurorotufozuxukoge.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/83948199445.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/datani.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631944845.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/28578619834.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5327a21f2---gajavakosisokejufikinaget.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/kibitezogowapeferugoxus.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/37302577243.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/92588497013.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/viputidogixararazakugonak.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/pivelevipebapibunugaganog.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/63764430458.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/78m5lve84g60boq0s927lejbc0/dasidulomuxitolid.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/3137754249.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/dolejebuxikivasosuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=read+only+contact+androidPDF 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_off0000abc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABC6 10356 bytes
SHA-256: c70ad8e4190c9e6a8911469254d1ff781d28c58ad8be1f090f4865bbd6cc4f12
font_01_sfnt_off0000c33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33E 14932 bytes
SHA-256: adf7466774b48c0758991b29e02a63675516d457c9db07d1f790051bff531c1b
font_02_sfnt_off0000e89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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