Malicious PDF — malware analysis report

Static analysis result for SHA-256 723a61884ffa4972…

MALICIOUS

PDF

74.5 KB Created: 2021-09-14 10:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c4c7c6e05414b4b54a44f054940f8a7f SHA-1: ab38ffaa6f06da82a649798f177b55898a083498 SHA-256: 723a61884ffa4972cec00984d517f60c6f1f7d2c68ab5b87594b3eed988f9b23
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing campaign. It contains numerous embedded URLs pointing to disposable domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://jiji.pgo.tw/pic/uploads/files/nenibopotobolozo.pdf In PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/49923721996.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/naferaditutobugovosizo.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/bapafokujotepovifakigoni.pdfIn PDF document text
    • https://tl-systems.hu/files/files/xigetemimowilolog.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/fotidifurobixebu.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/narotobamig.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/35025416932.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/10399130985.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210902033053466.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/33582471898.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/palideboxegexuf.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/64734425895.pdfIn PDF document text
    • http://egitara.com/upfiles/files/dijufalutodosob.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/wewaburumebutuxedaviv.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/58938290472.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/wuxogo.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021090408010673499.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/27225016246.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/66332829520.pdfIn PDF document text
    • https://flyags.com/editorResources/file///rogemis.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/23037973539.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/fijozogoxorifajudagage.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/96274723003.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///wupagosupenusexotaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=dsa+narasimha+karumanchiPDF 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_off0000c098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC098 17248 bytes
SHA-256: 8efd5ff0ce88908d51581828540b5d9570d861ea00fdafcb71fbc207c215e1c5
font_01_sfnt_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 10292 bytes
SHA-256: 6e0068016dd3d6f672fae807970fb6ea03c60095e908c5e356443cd28eeb7657
font_02_sfnt_off00010440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1