Malicious PDF — malware analysis report

Static analysis result for SHA-256 c769958d867ce4e6…

MALICIOUS

PDF

77.2 KB Created: 2021-03-10 21:56:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f06f03e93a1213ad9a52a7849cf3afd8 SHA-1: 773950a08b26078d01ced70cc503855e2bd70ded SHA-256: c769958d867ce4e66133c094e1f031efeb4062601f5b01a7832e342636d2467f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and ClamAV detection. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs suggest a phishing or malware distribution attempt, likely disguised as a report to trick users into clicking.

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://druttle.ru/123?utm_term=buffalo+dairy+farm+project+report+excel
    • http://summer-italy.fun/begasezaradetawipovopesobxsoon.pdf
    • http://joy-todays.online/26872086152lmqnr.pdf
    • https://cdn.sqhk.co/sifolilo/fXaiiUy/doxiko.pdf
    • http://teachersaid.fun/tetepejoferiwuxgk3xa.pdf
    • https://cdn.sqhk.co/wifinalimow/h1pohcO/download_volume_booster_program.pdf
    • https://cdn.sqhk.co/pawanipol/cbqlbEy/china_online_shopping_all_china_shopping_apps.pdf
    • https://cdn.sqhk.co/kagitenoru/hEih8ig/17450385031.pdf
    • https://cdn.sqhk.co/pajokiman/gfjbUib/gold_mountain_olympic_course_reviews.pdf
    • http://forexgeeks.net/adobe_photoshop_books_for_beginners_free_download_in_bengaliuiyix.pdf
    • http://irisca.online/mercado_livre_app_apk889p7.pdf
    • http://autocredit.moscow/7179112000305jy5.pdf
    • http://smeshnoykir.space/espn_fantasy_sports_specialist_work_at_homebh2e3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6922be75-9e36-4891-9038-0d39b729e15a/verbos_regulares_e_irregulares_en_ingles.pdf
    • https://uploads.strikinglycdn.com/files/ebc45752-99aa-4de9-a29d-ff1ba2bd1f88/how_to_replace_bruno_stairlift_battery.pdf
    • https://uploads.strikinglycdn.com/files/45b2658b-4423-4798-9423-4451549f4bf6/nososuzoxirumoxumupip.pdf
    • https://uploads.strikinglycdn.com/files/5db4673b-7e0f-479c-ba6e-44a522d03991/64007233544.pdf
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_16912c057487402a97f1cf73d2569bcc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9b46c662-62f2-4c30-a707-a9049fca3808/best_large_print_crossword_puzzle_books_for_seniors.pdf
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_9a3f8207e5fe430992dae6ab2d4cd717.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_off0000f083.bin
6b5427228f755f497c966f29bf3aec0e4b877ad98028190ccf2114c9b1097bfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF083 5416 bytes
font_01_sfnt_off000102f5.bin
8d750cf3e44d59c68e5fae90545b7f1ae81985d975cc6457b4d57d66eaef05f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102F5 11176 bytes

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