Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7501da4f553a74b…

MALICIOUS

PDF

78.4 KB Created: 2021-09-19 10:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0d1a2365c61ac46d8d0095f19c65bdaf SHA-1: f71bde41f9f9cf4bb436e689804c64955764ae4c SHA-256: f7501da4f553a74b6fed0ff50f881ec6c19da500f9ff9fc6bde21951212503f0
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF contains numerous links pointing to disposable hosts, suggesting a phishing or malware distribution scheme. The embedded URLs are the primary indicators of compromise, likely leading to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/8f36f51ce6e811662782eedbdffcb71b/95446423684.pdf In PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/lamasotilet.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109162310443110.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc66ab615f---10584429080.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/34280987967.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/wapupiwuve.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/39603097825.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/kegunenobapejafaji.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/fojitiziwalojuvapemi.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/87731533052.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/gutowisajelasuki.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/tuwokakimogowugap.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/10975444357.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/vosizal.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/zazugubogejugonuterela.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/visozisazugejivutaxes.pdfIn PDF document text
    • http://gibisch.org/files/files/18456687900.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/gulejojuvuxolaxad.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/xikoxosimadaxiwapakuwub.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/vumoru.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/kekopesaruj.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/17017211744.pdfIn PDF document text
    • http://cissi.it/userfiles/files/44784278974.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/beveseladin.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/51134536307.pdfIn PDF document text
    • https://phm.vn/upload/files/40754117336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=not+if+anything+to+say+about+it+i+havePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB33 10744 bytes
SHA-256: cfbc333b4bab6b984e85dac16f3e0d63f892e56c0b8911cd25ccc3c23979983c
font_02_sfnt_off0000f3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 17920 bytes
SHA-256: 1110538c2d2ee49431f4beb2b26a27dd1d4e2924654c5e26162c4174a20868fe
font_03_sfnt_off00012233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12233 2044 bytes
SHA-256: 97a693020a9c67c913fa5abf5d83a61848c846aa130c5182d8e66f233602b60d