Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb784ce93571afa4…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 12:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 859198cae86d38291387226f17b05f23 SHA-1: c3f0b1e3a31acf006666e21da2b695fb0313e09a SHA-256: bb784ce93571afa4bbce78b324837bdc6b2c291e4e08b1f402fd320c9e676145
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with a high-severity heuristic indicating a link to an algorithmically-generated URL. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of many external links points to a common technique for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613107e0c3bd9---48564144750.pdf In PDF document text
    • http://homeopathyhongkong.cn/files/14326666770.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/20793112359.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630767761.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/75581374238.pdfIn PDF document text
    • http://methese.com/upload/files/nipap.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090401081253.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219427257092.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81953836892.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/61201374848.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613eab12e56ad---kamovokilotizobep.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/8949406283.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/53013546046.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/59129465125.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/95941496439.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/86247775225.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/26268722687.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/80604380049.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/42956249322.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/55030314535.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/wiwulekozofavamiv.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/30399731899.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/49766476729.pdfIn PDF document text
    • http://texmet.pl/userimages/file/20108513239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=find+equation+of+parabola+with+focus+and+directrix+calculatorPDF 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_off0000d42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42C 11268 bytes
SHA-256: 6a74a8e83d705cb59f1578826ec054b5fba00a4ef75eda989ac18da304e36964
font_01_sfnt_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 19260 bytes
SHA-256: ef42ed7c37af66d4623567002d1af10d93a69bf6db7a754c9a7c2523e14f4bae
font_02_sfnt_off0001211c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1