Malicious PDF — malware analysis report

Static analysis result for SHA-256 7879fb0a0213eccd…

MALICIOUS

PDF

78.9 KB Created: 2021-06-03 22:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23bd6b1d3abd3d7ba5bee67bae36f8a4 SHA-1: dc12f9f2a836fe54bd4f463836d55b3b32799799 SHA-256: 7879fb0a0213eccde03f4a7d67af6441a8adb0925f1ec64caeeb6eb8757b8e2a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, with one prominent URL being https://nipisod.ru/123?utm_term=enable+developer+android+auto. ClamAV detected this as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The embedded URLs suggest an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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/123?utm_term=enable+developer+android+auto
    • https://cdn-cms.f-static.net/uploads/4418984/normal_6038c48e923f4.pdf
    • https://cdn-cms.f-static.net/uploads/4485161/normal_60697f1631633.pdf
    • https://nofokupefuw.weebly.com/uploads/1/3/4/6/134695722/zumedu-dejasu.pdf
    • https://cdn-cms.f-static.net/uploads/4403274/normal_605c319a54073.pdf
    • https://cdn-cms.f-static.net/uploads/4417045/normal_6056aafb72bc7.pdf
    • https://static.s123-cdn-static.com/uploads/4393044/normal_60069873539fa.pdf
    • https://cdn-cms.f-static.net/uploads/4379961/normal_604740667e284.pdf
    • https://cdn-cms.f-static.net/uploads/4368494/normal_602ca81d04eb5.pdf
    • https://lezojefob.weebly.com/uploads/1/3/5/3/135319065/8587972.pdf
    • https://static.s123-cdn-static.com/uploads/4469834/normal_5fe35be2d27eb.pdf
    • https://static.s123-cdn-static.com/uploads/4474997/normal_5fcfb3cd20edf.pdf
    • https://cdn-cms.f-static.net/uploads/4375507/normal_604ba51a24fb0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://banusiv.pbworks.com/f/14003702461.pdf
    • http://jifesepapo.pbworks.com/f/how_to_use_nexus_mod_manager_skyrim_se.pdf
    • http://zupelapowi.pbworks.com/w/file/fetch/144499047/pepenulepaloda.pdf
    • http://jujupaw.pbworks.com/f/buzitereguraxoxipaxi.pdf
    • http://demopefo.pbworks.com/w/file/fetch/144529098/hidden_figures_math_worksheet.pdf
    • http://fudejob.pbworks.com/w/file/fetch/144528792/corel_draw_x8_free_download_with_crack.pdf
    • http://mikabipi.pbworks.com/w/file/fetch/144433644/63512786564.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_off0000f684.bin
2969b9f5b5124a64a2d98906b0e6665d6e425bb7895efae4a6e6546bae2a45ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF684 4932 bytes
font_01_sfnt_off0001075a.bin
e803cc3c5442f35d3331e69c4ef40b8478d3613174b0ec60a089e3abab249c4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1075A 11332 bytes

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