Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b560d306b0267ff…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 11:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 43ce34ac0a590f717929a38a76e06d35 SHA-1: 0310fabdde09be50589cc2b88fc4e52b0f142b92 SHA-256: 7b560d306b0267ff0908738f265627895089301758e6547a43f5f0e2e8f1708e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The PDF appears to be a link farm, with many URLs pointing to PDF files on various domains, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/12589189330.pdf In PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/nekurutozizeweg.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/vovesumajerumodidiwaba.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210915_F7A4474CE71C2223.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/wasixobumizitawede.pdfIn PDF document text
    • https://etimes.mn/uploads/files/75932654856.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/mesarabok.pdfIn PDF document text
    • http://art-ball.net/files/file/wolivemaka.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/jodoxuxujuvanunavol.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/46445588817.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/87983063967.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/54e8ea40162ea6d7124eb69026abc1bd/kobarikovepiveganavegele.pdfIn PDF document text
    • https://alohasafaris.com/files/15415470244.pdfIn PDF document text
    • http://livestocktool.com/d/files/podirurojugavumutonura.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/fezasazovelimezomizi.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/jojeteginituwipubogabarik.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/mubiwafofezeze.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/simopobibedizu.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/71246989184.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/88242868291.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/xigozejugojipevoriveban.pdfIn PDF document text
    • http://lukinserv.hu/file/fuvozegab.pdfIn PDF document text
    • http://amdind.com/userfiles/file/demefopadodisolozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=videobuddy+apk+filePDF 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_off0000d8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FD 20728 bytes
SHA-256: 83a59d6c76cbcbeee37b1d681ec7cec5a0787baa9b7697828d11a4a7954581aa
font_01_sfnt_off00010ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C4 10436 bytes
SHA-256: c61b15f77add5fc2513cf7b81fb288318563ff6845457e54b73708eda00b3073

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