Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc28cf5fe23a350f…

MALICIOUS

PDF

74.3 KB Created: 2021-03-25 19:08:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec02051a81c99e2d88cde0c9b6df8f5d SHA-1: d64c095c076f667142e7274f4fa3f1b0b3810fd6 SHA-256: dc28cf5fe23a350fdfb43cb8854e1513f21edbbe6509e56336f5994a7cc02e47
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or distribute content. One of the embedded URLs, 'https://nipisod.ru/award?keyword=cade+simu+v3+pdf', is directly associated with the malicious verdict. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/award?keyword=cade+simu+v3+pdf
    • http://basepati.22web.org/billionaire_video_song_by_teni.pdf
    • https://cdn.sqhk.co/xolafunodo/Agdgj3G/roundup_rate_per_litre.pdf
    • https://cdn.sqhk.co/xexisini/gpPKj0y/kujuweviterevilapozumanoj.pdf
    • https://cdn.sqhk.co/remonupode/dJVggzg/fanufuf.pdf
    • https://cdn.sqhk.co/letaziseb/YEiihhj/live_streaming_channels_on_roku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wupiwupiwot/aged_care_guidelines_nsw.pdf
    • https://s3.amazonaws.com/wajibile/x_ray_diffractometer_schematic_diagram.pdf
    • https://uploads.strikinglycdn.com/files/eac4e833-cb0c-41e3-95ca-327b3aff06eb/54916996297.pdf
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_d3f5d637ec4d40e6ae2916efd63c0fd3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2b8a0a69-7af0-4df9-9195-ec852a715791/30341838731.pdf
    • https://s3.amazonaws.com/pulujolatepuv/mejabezajiribegupepaxu.pdf
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_f28769313c4949a798cada5b3ff33981.pdf?index=true
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_02117e82e4f84e5ba8bf11d9f5a828eb.pdf?index=true
    • http://tefotesibeto.epizy.com/botim_for_windows.pdf
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_acab8864a6d64a438bb49514b732157e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/28d2ffe0-4b17-47a7-8229-2b5da000ed90/wufupumor.pdf
    • https://uploads.strikinglycdn.com/files/7480c24b-e8ca-448d-862a-f4446190b41a/giwuwabejaxewepo.pdf
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_4ae55a739ad142da81e441b71235c03c.pdf?index=true
    • https://s3.amazonaws.com/dixaleko/why_does_my_id_say_not_for_real_id_purposes.pdf
    • https://uploads.strikinglycdn.com/files/0ba50671-6e10-4635-a746-2e704497078b/22475232744.pdf
    • https://uploads.strikinglycdn.com/files/bb5e58cf-6300-493f-bcb7-5d081a980cc5/kadejedumeravipalevon.pdf
    • https://uploads.strikinglycdn.com/files/8a1a31cc-b993-4bd7-9864-6e427d067689/furagawowosadudaxapipegu.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_off0000e75a.bin
8a874afbfdd54b09f88d8b71912e67f7f14bf1c6f0baf70d7b0d57121b0673c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE75A 5188 bytes
font_01_sfnt_off0000f8f9.bin
39b6771efc3727e2dd2363b66b0df9d0ac87b7e59dcf395c2ced28acd564bf3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F9 10536 bytes

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