Malicious PDF — malware analysis report

Static analysis result for SHA-256 a310e128a50a3351…

MALICIOUS

PDF

76.9 KB Created: 2021-04-04 05:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1683e2a42a65c3b7ccf6182501270ab SHA-1: df18eb10e1479ecd985b10932eff0ef12dbe86fe SHA-256: a310e128a50a3351412bd291c5a8a17912ede45c01de361a220ecf85cbcdd4ac
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, many of which are disguised as educational resources. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, with the primary goal appearing to be redirecting users to potentially harmful sites via the embedded URLs.

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://bologen.ru/award?keyword=multiplication+and+division+worksheets+for+grade+3+pdf
    • http://rasudilikid.mywebcommunity.org/the_ancient_secret_of_the_flower_of_life_summary.pdf
    • http://mezogevap.mypressonline.com/64152462797.pdf
    • https://cdn-cms.f-static.net/uploads/4443812/normal_6037ccbdd4a89.pdf
    • https://cdn.sqhk.co/wularumijif/hdG48gi/weather_chicago_monthly_averages.pdf
    • https://cdn-cms.f-static.net/uploads/4427783/normal_6017c981973b6.pdf
    • https://nenonafadigis.weebly.com/uploads/1/3/4/8/134856929/tiwupevewonow.pdf
    • https://cdn.sqhk.co/zudilubal/ji9sUja/picosecond_laser_pen_red_vs_blue.pdf
    • http://zuzavepojul.mygamesonline.org/84422587022.pdf
    • https://rovoduwomu.weebly.com/uploads/1/3/5/3/135332400/8015052.pdf
    • https://cdn.sqhk.co/koporikog/dP6ifYc/android_calendar_outlook_sync_problem.pdf
    • https://cdn-cms.f-static.net/uploads/4474169/normal_605c0d14da69c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mubemutolewe/free_html_tutorial_for_beginners.pdf
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_4fedb68fdec84a4ca227507084abbe4b.pdf?index=true
    • https://d190c387-1498-4382-a59e-98d1a0a9794c.filesusr.com/ugd/a91264_7fde95d7ddc946a1b478861c13c88f2b.pdf?index=true
    • https://s3.amazonaws.com/luborinizu/91980721476.pdf
    • https://s3.amazonaws.com/tokafanawa/free_vehicle_health_check_sheet.pdf
    • https://s3.amazonaws.com/sowewazulejewi/rurefexedutekesepubefozaf.pdf
    • https://9e4d96d7-92f1-4145-9aac-d1976e75dfe6.filesusr.com/ugd/49a98b_99f2737e8a234d978374a85278faa7f4.pdf?index=true
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_2302a370df584db4be31bc1df0fecc16.pdf?index=true
    • https://s3.amazonaws.com/likerajatob/what_led_to_the_renaissance_start_in_italy.pdf
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_19e45ea87e8540e6a68d4cf4af0f0cb1.pdf?index=true
    • 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_off0000ed33.bin
98134edd74f88caa7c5ffdb9fd75fddd8afd7a0b69817de09c619421a2ce739f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 5804 bytes
font_01_sfnt_off00010115.bin
2e7663954a0bab7e23573ea82dabcdc5a95d80e78ab5731fed03247b4b5f3fb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10115 10768 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.