Malicious PDF — malware analysis report

Static analysis result for SHA-256 503c9d7c5b3da771…

MALICIOUS

PDF

75.9 KB Created: 2021-05-11 23:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9bfcc7e886d292c0345dd4e1c08cd19 SHA-1: eb02d89ae942ee02971438317e1aee26424d6da6 SHA-256: 503c9d7c5b3da7712bce8e042a2bb3fc3010e67e1cdcd449f1faaa9653bb83b2
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that leads to a suspicious domain, identified by heuristics as potentially malicious and flagged by ML classifiers. The document body, though heavily obfuscated, suggests a lure related to poetry analysis, which is a common tactic for phishing or distributing further malware. The ClamAV detection further confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=how+to+describe+mood+in+a+poem
    • https://cdn.sqhk.co/buvovemif/hjhbhje/light_blue_and_purple_ombre_nails.pdf
    • http://kilijosizujowo.medianewsonline.com/cch_chuyn_i_file_sang_hnh_nh.pdf
    • http://wonnaturila.space/what_were_the_five_relationships_in_confucian_societynxol6.pdf
    • https://cdn.sqhk.co/gukugifixija/kjgNgcm/digi_online_store_delivery.pdf
    • https://cdn.sqhk.co/ledodatefu/idmhipe/rojuberupopanaber.pdf
    • https://cdn.sqhk.co/nobixapo/y6jhThd/cbse_class_8_maths_chapter_1_worksheet.pdf
    • http://lotupojaxuvutix.mygamesonline.org/cabala_libro.pdf
    • http://itdiscount.info/nipoluwimarodixivuzezojetm482m.pdf
    • https://cdn.sqhk.co/nivodoruw/gdUahik/young_carnatic_male_singers.pdf
    • http://rodsfish.club/jipasiwivepekevaxtl4q4.pdf
    • http://salet.store/super_mario_bros_2_3ds_walkthrough_world_2-a_star_coinsxjg4e.pdf
    • http://mon-fortuneo.best/beginner_running_program_for_5kepnrv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nokiva/bibogosumixum.pdf
    • http://vulopekusape.atwebpages.com/accounting_basics_tutorial_point.pdf
    • https://s3.amazonaws.com/buganabowumujef/flower_of_scotland_snare_drum_sheet_music.pdf
    • https://s3.amazonaws.com/fekazudabo/cant_connect_to_swann_cameras.pdf
    • https://s3.amazonaws.com/neviwove/telugu_new_songs_ringtones_free.pdf
    • https://s3.amazonaws.com/punagilelabon/reson.pdf
    • https://s3.amazonaws.com/jizubisetebof/16419545827.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_off0000eb03.bin
1f52e087aeb247a415b073821f36151e1cc32a8a24e1e9d52f39ca11fd069984
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 5380 bytes
font_01_sfnt_off0000fd3f.bin
3d91ee96310c715428ce101eca259be8bd6d632426e8f6e88a74b2791393e4d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3F 10924 bytes