Malicious PDF — malware analysis report

Static analysis result for SHA-256 815d6406a40df998…

MALICIOUS

PDF

83.5 KB Created: 2021-10-08 00:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 698329a7db46a381b09b48f82c90f846 SHA-1: b9bf2b580f2de1275eee049cf10c000d98f83670 SHA-256: 815d6406a40df9981109cb2cf647c8e2f8a548aa95ad03eeca893265958e3571
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by a machine learning classifier and ClamAV as malicious, indicating a high probability of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://erdenetpost.mn/userfiles/files/ditawimeselamuzejisez.pdf In PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021091215362973499.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/zumubeg.pdfIn PDF document text
    • http://signauction.net/userfiles/file/remoxox.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/bogeramatopewopenomizi.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/muxoz.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/rovuvanadigefogidote.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/71133431257.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/72374422559.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/46359840609.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/35746536027.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/87544780976.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/tebemuzux.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/fugoladoxo.pdfIn PDF document text
    • https://vgk.tw/upfile/files/2021/09/25/denaxarumizilorawag.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/nuxuwijetopixuxi.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16155adb2dff07---dolefujidup.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/32714662605.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/rirovozuni.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/12289008061.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/19693077608.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/83261500547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=calculate+effective+nuclear+chargePDF 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_off0000dd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B4 10524 bytes
SHA-256: 47430d407b6c7dc772d2b84a5ab2aa90461897ac4677730dcd44440b8ace3f04
font_02_sfnt_off00010da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA0 19352 bytes
SHA-256: e5aaef1ea5f55fa8014d0f5276021d31c720006d3208add18cb1d67d489f29d0

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