Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87713835a4bc3cc…

MALICIOUS

PDF

86.1 KB Created: 2021-09-21 03:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d872581615354d6b20c6eb46ae8d90be SHA-1: b2d91aaf9597c7991fc344dc79494789c1b44298 SHA-256: c87713835a4bc3cc6cfd5b6efc9aa5be3f70c2db6544b229c05461810a6f3eb0
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, indicating a likely phishing campaign or a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://medvor.ru/uplcv?utm_term=top+wwe+games+for+android PDF link annotation
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/rirovajivikoboxafupo.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/sixemiwatanaduvabumagiwi.pdfIn PDF document text
    • http://zerosquareonline.com/file/xezunisazepemab.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/4976413819.pdfIn PDF document text
    • http://agro-partner.com/Image/files/77865201389.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136481d21b02---fatusewugagu.pdfIn PDF document text
    • http://kbfrutos.sk/images/_file/pejakosagaxabirukibefo.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/13866276132.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/woduzavojiwabivelomazes.pdfIn PDF document text
    • http://eternoohydro.com/d/files/jibejuf.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/tenukibuzokidebu.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/zawavaxiginajafelomefoz.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/56620708237.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/lonulijozerufubolab.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/wevelubobep.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/34033438274.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/tivitokurek.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210916_191300.pdfIn PDF document text
    • https://o-dance.com/upload/files/wedegovonufawut.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/mivitidotavomidit.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/rakotukatoveketix.pdfIn PDF document text
    • http://apvn.info/userfiles/file/fefarekube.pdfIn PDF document text
    • http://heizler.hu/files/file/kotoxepume.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/bodisanexudiwonegopureze.pdfIn PDF document text
    • 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_off0000ef28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF28 10748 bytes
SHA-256: 628f14df667cd3268ac8cdc7231a0a7e703f55402d005764cc8856c738b5b6b4
font_01_sfnt_off000107b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC8 16664 bytes
SHA-256: 72f16f31fb959094a10b8ff518e73de09b0a983562662544b3dc7cb355b55aae

Open this report in the interactive analyzer, or submit your own file for analysis.