Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13244943ab7165d…

MALICIOUS

PDF

84.8 KB Created: 2021-09-17 08:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fcdc4cc3d948cbe41ad524c646a3a05e SHA-1: 3a371679d5ab78012a3013fa96793627759178f6 SHA-256: e13244943ab7165d9e21ad64a1d69ca654985d934c1f7555ed83e67d41867b48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, with a significant number of them identified as part of a link farm on disposable hosting. This suggests an attempt to distribute malicious content or conduct phishing operations by directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://form4concrete.ru/pics/cont/file/fatijosugunizojolotomowob.pdf In PDF document text
    • http://quatanggiabao.com/images/uploads/files/rugozikoxakagipatidejot.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/kusoxabid.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c15ba4249---nidadalavix.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/2c55f26e5bb633e04f7b4417fe95284f/61513669460.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/lisotimelukudivivulub.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/turazeju.pdfIn PDF document text
    • https://lederstuhl-shop.de/ckfinder/userfiles/files/surur.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/5517316608.pdfIn PDF document text
    • http://belv.ru/userfiles/file/wasifoka.pdfIn PDF document text
    • https://actor-conseil.com/files/file/12400444091.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/96089167307.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/menemuvobopovukedadel.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/malap.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/lagij.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/vomevamodegarur.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/59527288806.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/4866733072.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/49174967260.pdfIn PDF document text
    • http://eichler-kammerer.de/24858319872.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/58887969355.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/xagitebowa.pdfIn PDF document text
    • http://baoveantam.info/upload/files/59737202287.pdfIn PDF document text
    • https://basisangka.com/contents/files/21725432604.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/46898955707.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/xemudamibere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=tabbed+activity+android+studioPDF 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_off0000e604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE604 10700 bytes
SHA-256: b78357c56301c2bf74c3c050dd3c8badd87fa91be44fffa42fd755ced98e3683
font_01_sfnt_off0000fec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D5 17872 bytes
SHA-256: 9193e18acc1744763d1797e22ae8b4d3dda2aecff2f3dfaab68073782f998967