Malicious PDF — malware analysis report

Static analysis result for SHA-256 102b2d64227cea7e…

MALICIOUS

PDF

89.1 KB Created: 2021-10-19 18:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0644de5d79af6a81aae32bdde947401e SHA-1: ebd683e6c28719e18348e2c913e4077031468a55 SHA-256: 102b2d64227cea7e39bb5967ae3a7bf11df2a8290ef5c6fbdb7bec6bf38e300d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest an intent to redirect users to potentially malicious sites, likely for phishing or malware delivery. The presence of many unique domains and the use of UTM parameters in one URL further support this. The file's creation by wkhtmltopdf suggests it might be a generated document rather than a typical user-created one.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://laser-piskovani.cz/democms/userfiles/file/47173910594.pdf In PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/babixefuvere.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/12212689282.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/wofeduwejolexomojexi.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/motigakalajix.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/nilidaf.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/19222210967.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/3608398892.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/ledijeselusad.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/kafakituwewikokemewenagud.pdfIn PDF document text
    • http://keyday.ru/files/files/dugogatoja.pdfIn PDF document text
    • http://kaies.net/upfiles/file/jusulupopa.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/59088461175.pdfIn PDF document text
    • https://weingut-suppan.at/files/fevobusedawusebosatimusok.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/63836657922.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/suwajimupazigifufu.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/90503298680.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/fexuxazixalapoda.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161643681bbb27---tamasapoforizu.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/38031622189.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/zoriwet.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/81472479334.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/98963467633.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/oscUj7J0Gjw/uplcv?utm_term=math+teachers+guide+grade+10+unit+3PDF 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_off0000f4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 10924 bytes
SHA-256: 9406e3843e9b929083313a96495c9a39e0da60067485bb0f20dc464f549a08ea
font_02_sfnt_off00012610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12610 18424 bytes
SHA-256: 98b856ea98cb18f7c5f8b9cb67af324a95b586f23763ac81a9307f7d20aceec6