Malicious PDF — malware analysis report

Static analysis result for SHA-256 a084c8f18ed16723…

MALICIOUS

PDF

85.7 KB Created: 2021-04-03 08:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ec1fe539e968ba05adfdd2b6437f7b3 SHA-1: cf02539471b2f0be1abe856e96c3556f6e1b9c0e SHA-256: a084c8f18ed1672356654e3e910a1d0741bb29bc1355a615835ec63e6d5c9330
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, with a critical heuristic identifying it as a PDF SEO link farm. One of the primary external URIs, https://nipisod.ru/123?utm_term=acido+y+base+pdf, is flagged as unknown reputation and is likely malicious. The ClamAV detection and ML classifier also strongly indicate maliciousness, pointing towards a phishing or malware distribution scheme.

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://nipisod.ru/123?utm_term=acido+y+base+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f79ed5d8-e490-41fe-b42b-e2090084d4a3/kikukuso.pdf
    • https://uploads.strikinglycdn.com/files/d6f3b044-d3aa-4174-a419-274d3d15b711/dewakomoj.pdf
    • https://uploads.strikinglycdn.com/files/bd0aad93-d7e4-4d6e-ba97-3079577ff579/96539331295.pdf
    • https://uploads.strikinglycdn.com/files/ff769afa-0bbd-492f-871b-5984a345201f/java_programming_free_certification_course.pdf
    • https://uploads.strikinglycdn.com/files/5558655b-b96c-4192-9603-49a4563e66c3/can_i_put_gimp_on_a_chromebook.pdf
    • https://uploads.strikinglycdn.com/files/28fe8935-eb37-42c0-bf48-8a7c74a768cc/how_to_put_a_phone_on_hold.pdf
    • https://s3.amazonaws.com/warapagefasovi/boxing_star_full_game.pdf
    • https://uploads.strikinglycdn.com/files/13a0ffb8-2049-454e-be2b-ca0f12df4e5d/champion_generator_wheel_kit_40065.pdf
    • https://uploads.strikinglycdn.com/files/6b82d77f-f514-4d04-8dd4-1ad04bd306c9/como_estan_clasificados_los_derechos_humanos_en_la_constitucion_politica_de_colombia.pdf
    • https://uploads.strikinglycdn.com/files/8f4f5d57-912e-407f-b83c-ad0c734cbbd6/how_to_change_ink_cartridge_epson_xp_205.pdf
    • https://uploads.strikinglycdn.com/files/906edfbc-98a6-41ea-90e9-f0ef33b18343/98661736467.pdf
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_0fbe199c91f045589f39033bf3dcb804.pdf?index=true
    • https://37e79482-e567-4eff-b449-6ea9b90d4679.filesusr.com/ugd/cff0cd_05cc60fb9b654dc49fe42d5131373e64.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1fbbd664-74dd-4fa4-9f47-9e53dbe27326/tosax.pdf
    • https://s3.amazonaws.com/remuv/rascal_scooter_battery_life.pdf
    • https://uploads.strikinglycdn.com/files/cd4e7980-1951-4747-bcea-b64e2070bcbd/cen_tech_battery_charger_desul.pdf
    • https://uploads.strikinglycdn.com/files/2b6edcde-208b-4245-b225-be5af0d81c30/why_is_hajj_so_important.pdf
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_3dd9e72617584cf099ae5cdb282b5065.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d9f757ea-8691-41e4-8efb-0370e0f32790/tv_panasonic_viera_32_lcd_manual.pdf
    • https://uploads.strikinglycdn.com/files/a307264a-0d82-4de7-89a2-2ad493cdd29e/dutelobidabiti.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_off0000f733.bin
e43923869918f6fe4078ba9d3f340898a613591b7388bf619020e911e8f69c00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 5252 bytes
font_01_sfnt_off00010930.bin
18f9c21e1c2577f7d12bac55689cc3933b157a70a3c15ba31ba872e21030c613		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10930 13216 bytes
font_02_sfnt_off00013319.bin
586fd2d47d7ef655ac8fcedaf3a17ac43b55ee34544d24df6525aba8b365c669		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13319 16116 bytes

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