Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49f908e08f2096f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-23 23:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f241e144ba6a26000e6038289c7e66f3 SHA-1: a0469dbd0980569df96892417148594e29fceb7a SHA-256: a49f908e08f2096f3185292718b911b8a56b24d923d88bd93ab7c2be2152eff2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common attack pattern of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://queure.ru/uplcv?utm_term=redmi+note+8+android+10+download PDF link annotation
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/53672296050.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/dozejakebojopawexitorife.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/11822800526.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/11903295426.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210902_0D2CA97EEEA20310.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/rajuwipalijet.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/jadabitabakefexubijezego.pdfIn PDF document text
    • https://onecre.com/images/content/files/xurirabapaguwiputofim.pdfIn PDF document text
    • http://ihdbd.org/upload/files/pinurevuxaxosaxir.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/49644473241.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/juzozadozi.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/28599113769.pdfIn PDF document text
    • http://xtra360.net/campannas/file/veninakomamugagakezekuw.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/vopasodobodakovefir.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/4450412847.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/52128622971.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/31673956354.pdfIn PDF document text
    • http://armanetti.com/images/84090534623.pdfIn PDF document text
    • http://clickvay.com/upload/files/sepelatadavazop.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/sajus.pdfIn PDF document text
    • http://bdn10.cz/files/file/wojiwawojetufevixizunuf.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614096db971a5---33571154344.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/xedovadoji.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/pebisefimed.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/30894425539.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_off0000d8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B6 10752 bytes
SHA-256: 00c71e1830da22c87a1bf7f28717a107af99145c8a837e650fc55d52d4b90577
font_01_sfnt_off0000f17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17B 17760 bytes
SHA-256: 6e4dceee689b0ab2227bc08b2b0028f47b3da3170cd8490bce7d623e4907cad4
font_02_sfnt_off00011f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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