Malicious PDF — malware analysis report

Static analysis result for SHA-256 874df2f632017bd9…

MALICIOUS

PDF

69.9 KB Created: 2021-09-17 10:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3ef539685d7b3678001ddd56aab11d88 SHA-1: 9cbe3e9e35b64a190e965f5be94b108709649e23 SHA-256: 874df2f632017bd9ab2176ae9d0098fefd863348afb2da4cc54f84dcd1fae0b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=super+mario+64+download+android+apk PDF link annotation
    • http://szjglaw.com/uploadfile/file/2021091205301873499.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/gozoku.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/xumenowatibi.pdfIn PDF document text
    • http://winso.tw/userfiles/file/rumugebonowabigerumererel.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/bepufowadopakavo.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/noniwupugomigumuron.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/52043226371.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/1159369735.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/zazudexonituzitaj.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/puvib.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e464182c9---76397974162.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141102f6818b---23006166935.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/2082054850.pdfIn PDF document text
    • http://stroi-sistema.ru/img/53457728860.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210904000350.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/21665471093.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/47120409798.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/dezewilubiviziz.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/44065703385.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/91992217575.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/kazojoduk.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/7141151645.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/nagetesexen.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_off0000b061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB061 15684 bytes
SHA-256: efb629a91982bf0ec393f8f6a6480b0b8ad408574ff51f143ce5036284a7c29b
font_01_sfnt_off0000d8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 10888 bytes
SHA-256: a86112258dd155a034631f51122f35be651a0b87e843cbeb72d4dec18f5b79fc