Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9037bcf92c837d4…

MALICIOUS

PDF

97.0 KB Created: 2021-09-14 08:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8b319b525757276b6b81e2a242ab13b3 SHA-1: 8bac18aaa7ec37b19ab5bd1bbd0896b07d517494 SHA-256: f9037bcf92c837d4416448d6a33e417c8aaf34ecd6d7b10366e5b2cc2d00caee
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs that point to a link farm, suggesting a phishing or redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of distinct hosts and links, characteristic of efforts to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://creatinglifeoptions.com/userfiles/files/vibeputog.pdf In PDF document text
    • http://ciccioinpentola.com/userfiles/files/redifinanowifoxi.pdfIn PDF document text
    • http://nut-shell.net/upload/files/58637130407.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/paniruvofu.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/sipomogibatolegevevuvelav.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/63426816868.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/kojogaped.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/74722728360.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/wexafezezejuwakotafeboza.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/guwesagifowafekitidov.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/37291772680.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/44394555018.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/gakexopusulatilom.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109131348353632.pdfIn PDF document text
    • http://maidichike.com/upload/files/99442733923.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/tafobazubosidi.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/nasokobemozizulideged.pdfIn PDF document text
    • http://runhouchem.com/upload/files/24285802806.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/87802726597.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613626894f33b---64489681882.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/vajezediwuguduxegu.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/napalilulaxetili.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631314407.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/97033585628.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/didiliriwesilifuri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=fundamentals+of+fluid+mechanics+8th+edition+pdfPDF 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_off0001161e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161E 11068 bytes
SHA-256: 385684c17bb1c9e88fa8f88b57c118a1ea0badc406531dd988941b4d19343d23
font_01_sfnt_off00012faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAF 17660 bytes
SHA-256: be2c6efacf247d323e2aa328edb111ccc6406aa6ec801350c91f1de924e4a51e
font_02_sfnt_off00015dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1