Malicious PDF — malware analysis report

Static analysis result for SHA-256 e829ba8f86bd9af1…

MALICIOUS

PDF

81.5 KB Created: 2021-09-11 08:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 566509bb7d128066afab30f9f2a7a4b0 SHA-1: a89b71bbd55975687a0dc3a4672728bd17619bd4 SHA-256: e829ba8f86bd9af1883fa33568dbf1604a31e2c58596669966f0cdacaeb47df1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to disposable domains and configured as a link farm, strongly suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kaptenhoki.net/contents/files/61634266777.pdf In PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/82466315033.pdfIn PDF document text
    • http://espokebar.com/uploads/files/80422584542.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/namogux.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090210211837.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/roranolebipukegojin.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f46db07fd6---92546405870.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/dezekamanubeza.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/50224587507.pdfIn PDF document text
    • http://ijfbn.com/editor_up/68403365712.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/rawix.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/73970011849.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/50895843281.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/kigekakitase.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/navonomipu.pdfIn PDF document text
    • http://rcmo.ru/upload/files/natobufabobinolodofixiliv.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/94829226028.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109082203237450.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/58440049293.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/sudugawolisifoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=frindle+full+book+pdf+freePDF 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_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 17752 bytes
SHA-256: 698732857bea81f60124abc38531b3e95f4c8c88e495eb84d23251b3d44d6ecf
font_01_sfnt_off00010902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12119 10372 bytes
SHA-256: e93943786253a7651f57d030a30966551464b95b760319fc6c6dd2edba0d6efb

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