Malicious PDF — malware analysis report

Static analysis result for SHA-256 60eaa10e1f303d5e…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 16:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1811803ed14f0178d5167a391e0830d5 SHA-1: 97cc47243538c10e3cd5b8895ae23a0b47d9b409 SHA-256: 60eaa10e1f303d5e4fdaa3c977047620e2c11dcee7e1f5584d294fe1ce4de55f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to other PDF files. One of these URLs, http://helloslow.com/data/userfiles/files/zurezivizikemawoba.pdf, is a key indicator of the malicious infrastructure.

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 http://helloslow.com/data/userfiles/files/zurezivizikemawoba.pdf In PDF document text
    • http://mobiliteit.nu/files/86529529397.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/38293331301.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/26061654199.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/60396278363.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/5028997992.pdfIn PDF document text
    • http://a899.net/userfiles/file/ludaparilesaxukadegusojes.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/virikegukafupumimofe.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/16019651312.pdfIn PDF document text
    • http://surtek.biz/image/files/20150329_191149.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/54939399906.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1630655351.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/46810159393.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/zinoxajabi.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/44664701302.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210907080553.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/kasopojodiregovukozavegu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/21334545020.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/21347375508.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/31364927994.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/87781603486.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/nutapunavuzebavurabek.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/ziruwu.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/fixonefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=house+3d+layoutPDF 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_off0000d79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79E 18136 bytes
SHA-256: 5cdbd346ed090832056c928f5e8841f23e110888275b79972a75b29c82706e8b
font_01_sfnt_off00010690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA7 10320 bytes
SHA-256: 21906c67e514c342dc710a4c4db30445ec1f3ed90ae661a2b2a31fe345e89496

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