Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab878896fa9269e…

MALICIOUS

PDF

74.8 KB Created: 2021-09-24 23:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: b1c5efd2f4dcc9b7e246e0aa844bfc44 SHA-1: 6f6d623c77128aa1c5605f9436f02c29ba4fbba2 SHA-256: 3ab878896fa9269ed5f48b1e086b437aede3ae366666345ed50d4bde7461ca77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8438

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://leeharringtonhomes.com/userfiles/file/xekevogefumifilavezadeb.pdf In PDF document text
    • http://rebizplus.com/userfiles/file/mefomakinag.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/90313070226.pdfIn PDF document text
    • https://clubharison.com/userfiles/file/65179308072.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/3763972166.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/zakatezitotofopulefenefa.pdfIn PDF document text
    • https://dacola.com/upload/files/81475983722.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/67386758640.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/dewaxukatonokof.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/3071341852.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/95603669478.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/sejekarugo.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b36bc634a6---6171979807.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/wajigikeneforusofawape.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/zevebipabidineguzalasel.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/35474343825.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/gisaxiridilopudirivu.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/tolus.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/50679224708.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371dc991ff6---sixezopopural.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/jiwagosenejimeviba.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210903070445_245463491.pdfIn PDF document text
    • http://abnicum.ru/files/file/31851038631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=android+wifi+sifre+gosterme+rootsuzPDF link annotation
    • 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_off0000c107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC107 10716 bytes
SHA-256: 4c93906ba0d60e3bfce0abdea5c3725510540cd3273391d81a4a45d6839e5ffa
font_01_sfnt_off0000d98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98B 19920 bytes
SHA-256: 0095cbdd1d1381e05751afa14984c3714496b7f92b315a2359e3f524ecdcd7c6
font_02_sfnt_off00010d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1