Malicious PDF — malware analysis report

Static analysis result for SHA-256 488ae0567abf7cfc…

MALICIOUS

PDF

70.1 KB Created: 2021-06-13 16:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: daaf374772f3d0eb548fb6d5eca58832 SHA-1: e0e7f76071a2d8a783dbfa100f89c4a8aba41f90 SHA-256: 488ae0567abf7cfc1a6112ddd7eb917b16ebbe298c0fcf8f6ffb6d5bc0f243d9
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier strongly indicated maliciousness, and the presence of external URIs further supports this assessment. The document body, though heavily obfuscated, contains text related to 'mp3 free download', aligning with a lure to entice users to click on malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://nomylo.ru/pbw?utm_term=sanam+teri+kasam+mp3+free+download
    • https://cdn-cms.f-static.net/uploads/4493867/normal_603bb0f93a132.pdf
    • https://sonodube.weebly.com/uploads/1/3/7/5/137517068/rafafixad_bodof.pdf
    • https://pojalizug.weebly.com/uploads/1/3/4/5/134591246/3796431.pdf
    • https://static.s123-cdn-static.com/uploads/4467573/normal_5fdebb476b2e1.pdf
    • https://rifakinuzofu.weebly.com/uploads/1/3/0/8/130815009/3942886.pdf
    • https://lawawumusew.weebly.com/uploads/1/3/4/7/134765042/gezide-bitupata-vavamukesolo-wefexolavuju.pdf
    • https://cdn-cms.f-static.net/uploads/4456998/normal_6048f3e12f2e2.pdf
    • https://rofubedojatedo.weebly.com/uploads/1/3/4/5/134586725/gufotozojixasulexe.pdf
    • https://rimivitelur.weebly.com/uploads/1/3/0/7/130739194/pirorukef_xutivomokemif.pdf
    • https://mowibusox.weebly.com/uploads/1/3/4/5/134591082/9244402.pdf
    • https://lalazifesulalo.weebly.com/uploads/1/3/4/5/134502535/ruregizoleradar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6b8ff8c3-eb2e-4958-a0b1-77ccccdfe318/durusuradudupi.pdf
    • http://gujavitax.pbworks.com/f/vulakukuvufapip.pdf
    • https://uploads.strikinglycdn.com/files/33ba327f-33d8-464c-81f1-57d4e3604cb1/37453146133.pdf
    • http://mizelabe.pbworks.com/f/mubedujaku.pdf
    • http://serukula.pbworks.com/f/660631047.pdf
    • http://lonazetubuz.pbworks.com/w/file/fetch/145211727/mistaken_identity_in_twelfth_night.pdf
    • http://dewubuk.pbworks.com/w/file/fetch/144656250/94352418091.pdf
    • http://xugatun.pbworks.com/w/file/fetch/144672990/muzefitenidunef.pdf
    • https://uploads.strikinglycdn.com/files/aa63090a-1c48-48fb-9e57-6fef2b44cefc/perspective_drawing_free_download.pdf
    • https://uploads.strikinglycdn.com/files/577217d1-ce60-481d-b257-4a275d14c0c9/belivizof.pdf
    • http://wovonixir.pbworks.com/w/file/fetch/144731445/zuvowedawusidulatije.pdf
    • http://vikiruji.pbworks.com/w/file/fetch/145090008/16490772085.pdf
    • http://funinupun.pbworks.com/f/is_zeus_stronger_than_thor.pdf
    • http://tusoxefum.pbworks.com/w/file/fetch/144473835/xemipotirobifosil.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2c7.bin
de81830d8c46634fb2cfb0ed8c2ac73b8c1e59d607bf817ec64b5a81a440be89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C7 5608 bytes
font_01_sfnt_off0000e5de.bin
abc1d676ac91e7dd86945b152a8ce965b47d4c52bf0f7ad86bfe3818066e1133		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 10912 bytes

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