Malicious PDF — malware analysis report

Static analysis result for SHA-256 44231cfb090f7aff…

MALICIOUS

PDF

135.3 KB Created: 2021-03-07 12:47:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45cd2b966148629ca600b1f5861ed5d6 SHA-1: a054803303f98b91c998f0268ea2a9dfdb4bc4b5 SHA-256: 44231cfb090f7aff6411ab4f02d07caea21fce55e41e1b975298714ed0c4cd19
96 Risk Score

Malware Insights

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

The PDF contains embedded URLs pointing to suspicious domains, with one specifically referencing 'Left 4 Dead' game content, suggesting a lure for phishing or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the nature of the PDF detection point towards it being used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 4

  • 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://dafemum.ru/wix?keyword=left+4+dead+spitter+theme
    • http://tinubovibiwiwi.iblogger.org/bulats_demo_test_answers.pdf
    • http://comp-arenda.site/92416505091xipsh.pdf
    • http://belplitka.ru/49640650091usdss.pdf
    • http://inmyshtangen.xyz/kindle_fire_keyboard_caseyg6b1.pdf
    • http://fekosuse.getenjoyment.net/83217987614.pdf
    • http://pravagims.net/motif_batik_nusantarab6g49.pdf
    • http://e-devletturkiyeaidatsistemimgovtr.com/kaththi_video_songs_720phdfbowb.pdf
    • http://idealslim-italiaofficial.site/kevetunejum2f9js.pdf
    • http://magnifioco.site/noruwiworigiwizonatofz5vfo.pdf
    • http://inostrana.com/best_workout_equipment_for_home_cheapx4hzc.pdf
    • http://bometaximom.scienceontheweb.net/what_does_the_bible_say_about_being_single_for_life.pdf
    • http://zavarivaemvmeste.ru/wufujuterinupiseriribaese9s.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fc8cda04-c920-4d45-bae2-c15f943987db/63285573723.pdf
    • https://uploads.strikinglycdn.com/files/d681d867-d565-41d3-803a-bc25fab39bc4/82208773236.pdf
    • http://jigosip.epizy.com/54773066738.pdf
    • https://uploads.strikinglycdn.com/files/cefb44b8-e516-40ce-9522-a679ef4478f4/what_are_the_four_principles_of_nonverbal_communication.pdf
    • https://s3.amazonaws.com/loranoduzuja/jovilexotedarinuzatedupuw.pdf
    • http://wexotorat.rf.gd/sikutavulutalifasosipopi.pdf
    • https://uploads.strikinglycdn.com/files/fc2a23a3-a11e-464f-b354-ac856008d0d1/how_do_i_reset_my_radio_shack_scanner.pdf
    • https://uploads.strikinglycdn.com/files/19385e06-5d12-4634-9bd8-b3cbc3ab0a23/vegikogisuz.pdf
    • https://s3.amazonaws.com/bokelur/new_company_introduction_email_template.pdf
    • http://sudexixurijaxoz.atwebpages.com/rawiwutojapufuwej.pdf
    • https://s3.amazonaws.com/jusuberu/altec_lansing_lifejacket_3_waterproof_floating_bluetooth_speaker.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bb79.bin
85afbf9ccd246ced998f67bf05cea46a29a1d6042ef97485d8c2d5174f9edcb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB79 8512 bytes
font_01_sfnt_off0001d83d.bin
b8894822947c8db62e83e50d73e088e1c8f8d1b16544387d81d459f12a461a6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D83D 5276 bytes
font_02_sfnt_off0001ea15.bin
4e2c13c24b9e3fd45b6a8c32169f167f2f5756eacbe9e1835a02d595e78784ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA15 10820 bytes

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