Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bac4b315bec44ab…

MALICIOUS

PDF

75.0 KB Created: 2021-09-09 08:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 729e9fca30e60848523b437f9a805bb8 SHA-1: 8ec1ad7334e1f53d2657a5228521c1d9ea9dd41b SHA-256: 3bac4b315bec44ab63af4f277f58cf345ca6a46dd974389e55b6b9a91ade082e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=best+apk+apps PDF link annotation
    • https://www.winsum.frl/ckfinder/userfiles/files/53898658196.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/22972998944.pdfIn PDF document text
    • https://trexanh.net/upload/files/ponijoba.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/tonimunaluv.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210905_812D761D8B743457.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/kisusifedetumiwomavukumix.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/apmsi8b8n1t0lrjgmm1855pnfr/54620947445.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/xidewatifabowov.pdfIn PDF document text
    • http://change4best.ru/upload/file/dujezidiniwopur.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/76269400698.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/8530758193.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/tofumowadezokaxopipu.pdfIn PDF document text
    • http://mobil-tech.com/files/91823634113.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/domeledonuz.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/tonafosonibe.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/bifafulebanezaxele.pdfIn PDF document text
    • https://kaimano.it/file/sinedipojadib.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/lofov.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/66086371503.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/wemobedosegekefos.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/tonugerewofixikokol.pdfIn PDF document text
    • http://spharma.ua/files/file/3231217314.pdfIn PDF document text
    • http://boldogelet.hu/media/71359884047.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/beruvixilevutetuvonag.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_off0000c2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABA 9928 bytes
SHA-256: 5aa95bad5c51a5734810d56eb8bbdbdac19b2c4d50d3308e152d52d4624de50e
font_02_sfnt_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 17632 bytes
SHA-256: b2435f5f8150731be71d46623fd4ca140c4aeb595f8006c0cc7a9171381bff8d

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