Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf016a4461840ce…

MALICIOUS

PDF

77.3 KB Created: 2021-09-09 06:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b4c94f690651ef122970a88d3f802258 SHA-1: 9fd9365f6b4991f46941ac015f449ac8673ed3d0 SHA-256: 8bf016a4461840ce88789d004aef269304eecfa71e866f707248775d39ae4443
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, many of which point to disposable hosting and are likely used for redirection to malicious content or phishing pages. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://drafthe.ru/uplcv?utm_term=watch+here+are+the+young+men+online+free PDF link annotation
    • https://pemaboutiquehotel.com/assets/userfiles/files/43276776815.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/61937350563.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/61376645722.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/57321208248.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/64008567159.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/20890329698.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/76714374671.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/rodenasufulaguzuwafodelod.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/45881809085.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/35391998640.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/zepot.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/78650989978.pdfIn PDF document text
    • http://petrduchek.com/files/raxidifagiwokowavikosewe.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/likofowovurekibana.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/jusulokarodaxezujona.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/98757992733.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1lt75lpusqunfe1jnjkrd2vkn0/misovixojulamilojebek.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/rozukageketefotikonu.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/8017801516.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/gakomutonigidiw.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/gizetezolajatabepivaso.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/wojexi.pdfIn PDF document text
    • http://moristas.com/userfiles/files/10581439873.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/fuzumofosozituk.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_off0000c8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F0 17748 bytes
SHA-256: 0c9ab82f31d5e7571a07f655a1a64d5f95e7860c1eadf1be6f14b82d266bf668
font_02_sfnt_off00010efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFD 10824 bytes
SHA-256: d7850d02dc4a65f24f661b0c9a87fa203ff0ae96bd6181022fc3a6462ac53ae1

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