Malicious PDF — malware analysis report

Static analysis result for SHA-256 d348b9b011f8dc40…

MALICIOUS

PDF

84.5 KB Created: 2021-03-18 01:46:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a929e6eb744d96936607e78ddd6e16d SHA-1: d6dc13a2716ad250da991c0034b4b227ec695d72 SHA-256: d348b9b011f8dc4026160eebce0a4abbdd8726f24ec1f37f0af8781fbb419999
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The embedded URL and the document body, though partially corrupted, suggest a lure related to Samsung washing machine repair services, aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/aws?utm_term=samsung+washing+machine+repair+service+centre
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/f51c8500b2d.pdf
    • https://cdn.sqhk.co/kibukumivu/idffLTR/chronicle_of_the_dead_movie_free.pdf
    • https://migawireradafus.weebly.com/uploads/1/3/2/6/132695569/447a59f.pdf
    • https://vefurubaturuxal.weebly.com/uploads/1/3/0/7/130739777/foxikoz-zonekenuzu-xadeted.pdf
    • https://cdn.sqhk.co/wugotiparo/9y7zaoh/sci_fi_sound_effects_pack_free.pdf
    • https://cdn.sqhk.co/fularulojoze/cgehzWp/royal_enfield_himalayan_bs6_brochure.pdf
    • https://cdn.sqhk.co/vujejanar/4v5idjc/auto_reply_message_sample_for_vacation.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zenejifawulo.epizy.com/zudunodulisefuni.pdf
    • https://uploads.strikinglycdn.com/files/1ac243b4-baca-455c-9937-49ab52b2149b/walmart_store_hours_omaha_nebraska.pdf
    • https://uploads.strikinglycdn.com/files/ec576c58-9aea-4e27-ba60-06b4af11a05f/73788278712.pdf
    • https://uploads.strikinglycdn.com/files/482ebc89-aaef-4290-814c-57767245c6e4/64944755515.pdf
    • http://wijixetav.epizy.com/57073400109.pdf
    • http://vetodegadema.rf.gd/void_a_check_on_quickbooks_online.pdf
    • https://uploads.strikinglycdn.com/files/edc635b4-b548-4069-9c55-c5b1910e88ea/1st_grade_handwriting_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/cb02d293-4fa9-495b-8f5f-13231fe8e2db/what_is_the_6th_harry_potter_movie_called.pdf
    • http://kesufelitam.rf.gd/gutakakajudoguxemilis.pdf
    • http://zawuzujuw.epizy.com/25488520997.pdf
    • https://uploads.strikinglycdn.com/files/7c60d05b-5ecd-4f9c-ab7b-6e519649d04e/lenovo_g50-45_windows_7_32_bit_driver.pdf
    • http://firosuvidafodi.rf.gd/love_failure_album_song_isaimini.pdf
    • https://uploads.strikinglycdn.com/files/dbfe5e28-0825-4ffe-8163-1d08a5cf8152/what_was_gained_by_the_treaty_of_guadalupe_hidalgo.pdf
    • https://uploads.strikinglycdn.com/files/1fe7bc9b-e099-403a-bc07-6370640726ff/how_to_replace_switch_on_rainbow_vacuum.pdf
    • http://vedopurunidir.epizy.com/kidujenudulalo.pdf
    • http://xifenarubomes.rf.gd/how_to_install_a_3_wire_dryer_outlet.pdf
    • https://uploads.strikinglycdn.com/files/7f7e6866-db95-4814-9716-30eeab507673/nc_road_signs_list.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_off00010de6.bin
25b133b97145987c4aebb8b4c663bb97a903f901fcb8dc030ce4e0d83a2cc172		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE6 5572 bytes
font_01_sfnt_off000120c4.bin
773cc1ed537f12bfda156db1075b3827baa28266a5f26f16b97f7141a90e82d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120C4 10376 bytes

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