Malicious PDF — malware analysis report

Static analysis result for SHA-256 32a46416fd222246…

MALICIOUS

PDF

89.4 KB Created: 2021-09-09 04:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 15bf6b7bedac80336de304b5c4aa935e SHA-1: 3edf90a0f9dbeacac1d47842a7662c7bdf157f13 SHA-256: 32a46416fd2222469b1d3aaf5192a8be55e681ed880c12b941e64bb2466c3fd9
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a variety of domains, flagged as a link farm. The ML classifier strongly indicates maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the embedded links. The primary purpose appears to be directing users to a network of potentially malicious or SEO-abusing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 4

  • 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://celyroknaterase.sk/editor_uploads/system/files/14511109369.pdf In PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/pulunaw.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/kabiritemalefotutisulave.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/67644960355.pdfIn PDF document text
    • http://polletnv.be/uploads/files/feraxufumunegomusinika.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/mawazikedid.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/76659253600.pdfIn PDF document text
    • http://tunhuaduytan.com/upload/userfiles/files/fitakiparevipidovid.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202108312221588740.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/89898234099.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/60446737086.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/dawosinukibaruvezakifat.pdfIn PDF document text
    • http://stroi-sistema.ru/img/10998793757.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/buronafuwizaperupopogul.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/gomexizapopagofifufexax.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/81862602332.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/7637339932.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161328bdea6e69---wavunevemebalubugefowunu.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/kitaj.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161388a79f4030---widis.pdfIn PDF document text
    • https://basisnomor.com/contents/files/6268630714.pdfIn PDF document text
    • https://atavio.ru/files/file/46106152081.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/63118246148.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/davabam.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/51179110016.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/47063170702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=watch+80s+movies+online+freePDF 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_off0000f8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F7 10988 bytes
SHA-256: f6a2491d754ec9e14897504d90eb26fcb1e1208fea30c25af00331a124423f66
font_01_sfnt_off0001125f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A71 17804 bytes
SHA-256: f47efc27b0b3782a313fbb78f4fd69ce60be30b51ae1d964b8e9dd76d81f7983