Malicious PDF — malware analysis report

Static analysis result for SHA-256 600c77b61747fa74…

MALICIOUS

PDF

82.6 KB Created: 2021-09-10 03:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8bbe7a88f5597a8392e4ab8277586516 SHA-1: a05e59c6cf603b8d7ad59578ef3c84a502d6b161 SHA-256: 600c77b61747fa74dd7592bccb57d7eb7798f92e348298b437497277633b7bb4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to suspicious domains and identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • 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.
  • 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://qdjshg.com/files/file/wuluvodusipoxifodise.pdf In PDF document text
    • https://mgs-on-track.com/uploads/misc/files/zarixup.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/36662043274.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/vupitokolibadenoxumona.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/090105339288.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161303070a818b---doxebikufonuxepazodavu.pdfIn PDF document text
    • http://isvpro.com/custom/files/zajajajavixitaniraxun.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/wenuvogefalodekiz.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/wewuzawitepijijonafufim.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/97873117724.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/75b9e55ef882c1c41b63bc8ff7f2a6f1/zefezaxulopogu.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/66475098435.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/86769827511.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/58692202496.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/vubadevewesigi.pdfIn PDF document text
    • https://badrivishal.com/media/lizogugilafebonerofosuz.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/3203981774.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/doxivovetobosuzamifobu.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/nosenepesejezumuverexoj.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/98665328193.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/nozobuvepuba.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/kimubamuraxalexakivisitop.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/pijamarifunurikafuvo.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/desavokufe.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/rukelavujuburunizul.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/78187543861.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/gifawupelevupimijasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=best+app+hiding+application+for+androidPDF 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_off0000de4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF664 10952 bytes
SHA-256: 79e8d26b1e1c560ae20bd28c3784d03df46bb32a4120df0561419f9888009484
font_02_sfnt_off00010f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F84 17348 bytes
SHA-256: 2bd2285ae99dcb733ce0a091258a64d6bf08a802f304d086b6514bfdab7f7d81