Malicious PDF — malware analysis report

Static analysis result for SHA-256 2511fc086c5064b6…

MALICIOUS

PDF

89.5 KB Created: 2021-06-13 12:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15d9d746ca504d0a39253d87690db3c4 SHA-1: dafa0a8d5da7ddc99a285f49b4839f1636a4eefb SHA-256: 2511fc086c5064b6f55aefc6ffef8e82467bc52c73943720a3ed72e9254f8ada
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL being 'https://krisoc.ru/pbw?utm_term=don+moen+uncharted+territory+mp3+download'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a malicious intent to redirect users. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://krisoc.ru/pbw?utm_term=don+moen+uncharted+territory+mp3+download
    • https://sawamamuwez.weebly.com/uploads/1/3/5/9/135992332/jizilatezadawaf.pdf
    • https://busuguzokiw.weebly.com/uploads/1/3/1/4/131406797/sobupa_dovenaveb_pufugoxuxod.pdf
    • https://rebijigubewu.weebly.com/uploads/1/3/4/7/134770847/bumesexitaje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6eff3de5-cfc0-43bf-9637-894d4339a1af/93900017894.pdf
    • https://uploads.strikinglycdn.com/files/56a88f51-b597-4af8-870b-08559e525327/xilesekajuvixoko.pdf
    • https://uploads.strikinglycdn.com/files/bfa22e83-82e5-4aad-a9ee-08ffe0b922f9/menaselamakoweki.pdf
    • http://sebevowan.pbworks.com/w/file/fetch/145080231/camp_buddy_torrent.pdf
    • http://dimutojopog.pbworks.com/f/penidovaxolun.pdf
    • http://pejokawigar.pbworks.com/f/ribabexebademiwisiz.pdf
    • https://uploads.strikinglycdn.com/files/801001ff-efac-406d-a90c-9d92646d4c7d/what_does_cl_mean_on_my_lg_inverter_direct_drive_washing_machine.pdf
    • http://jevibufile.pbworks.com/w/file/fetch/144674097/34730001399.pdf
    • http://xizisimavi.pbworks.com/f/virodi.pdf
    • http://wiminupi.pbworks.com/f/demonology_warlock_leveling_guide.pdf
    • https://uploads.strikinglycdn.com/files/37010de4-354b-424e-b5df-af52ba712ea8/56273840194.pdf
    • http://tereburokofe.pbworks.com/w/file/fetch/145172205/repiwa.pdf
    • https://uploads.strikinglycdn.com/files/19c6c77b-dbac-4b8f-8f74-046f44501621/56606214149.pdf
    • https://uploads.strikinglycdn.com/files/61180792-cbf1-40d2-afce-2442aa415662/ventajas_y_desventajas_de_procedimiento_de_inventarios_perpetuos.pdf
    • https://uploads.strikinglycdn.com/files/6e7aaefb-6b2f-4b98-9590-114ffd211edc/dodge_ram_1500_oem_parts_catalog.pdf
    • http://goxuluk.pbworks.com/w/file/fetch/145125591/felebewesigino.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109ea.bin
71752938968d8a14114cf638345b8e509581e3d9d062418675b7a1dead7d77d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109EA 5492 bytes
font_01_sfnt_off00011c8d.bin
68daf1e503870ac962647c1842ec2ba056a897da360143f4c2b2baa189542aeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8D 11184 bytes
font_02_sfnt_off000142d9.bin
5e10d478a33d17089176b5c5088a57cfaaee63ec2e6001132e2e630e0c8c5d76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142D9 16204 bytes

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