Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b242aa77c8db88e…

MALICIOUS

PDF

86.6 KB Created: 2021-09-10 06:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 69ab771cf091b8bfc90ee0183bda94e2 SHA-1: 918e9a04b97cbba945fba2973f0164464666088a SHA-256: 1b242aa77c8db88e6c014c3b5afc647fde2d8a75c4cd0b1658378b0d0a0b42c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely leading to malicious downloads or phishing sites. Although no scripts were directly extracted, the presence of many embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://liderzy.natura2000.pl/imgturysta/files/novosevidipukutowidaj.pdf In PDF document text
    • http://exteractif.fr/pictures/2/11429386558.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/xiruw.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/xinivizew.pdfIn PDF document text
    • http://emannsltd.com/userfiles/55881198285.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/43639211668.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/kuvenedi.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/zarovawikevo.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/pebulaperaxikifi.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/regoveviman.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/goneg.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/nepijakipugoxexin.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/xunonesipaju.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/kevomowisope.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/19583721248.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/wuvapo.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/tikogumefupuzapadiwijalu.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/45665243955.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/goginubisabifojilib.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139b8510ff44---7066077393.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/pusunugikanumikijimijasu.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25227150354.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/54180558431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=android+sync+software+download+for+pcPDF 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_off0000ee41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE41 17776 bytes
SHA-256: 5068b2279081265cd315f2faf47466cda81ec56a00dd9253479cf2f4f332fd44
font_01_sfnt_off00011bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13403 10796 bytes
SHA-256: 70452352c1428377d37f2b4ffc0580f670350205b641c50f6265ae7e61755882

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