Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a8d4668c7094d8…

MALICIOUS

PDF

82.0 KB Created: 2021-04-03 22:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 777df6bd2e255f9995c640bdb217a4d9 SHA-1: bf38978064d334f48d2efa0850d70db3bbf7cc2f SHA-256: a1a8d4668c7094d8f8875be47880d13000037861ea6687f65d913f3c06941835
96 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing or malware distribution site. The PDF structure itself also shows signs of manipulation with duplicate object bodies, which can be used to obfuscate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/wix?keyword=home+sheep+home+2+london+walkthrough
    • http://lubevos.scienceontheweb.net/78936509482.pdf
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdf
    • https://cdn-cms.f-static.net/uploads/4470698/normal_601878210f234.pdf
    • https://cdn-cms.f-static.net/uploads/4451230/normal_601f0c7749fb1.pdf
    • https://cdn-cms.f-static.net/uploads/4448976/normal_5fd1596ed4b1c.pdf
    • https://static.s123-cdn-static.com/uploads/4450628/normal_5fcb2c0ea968d.pdf
    • http://zuzavepojul.mygamesonline.org/bass_guitar_chords_chart.pdf
    • https://static.s123-cdn-static.com/uploads/4416789/normal_5ffeb3a90bbd7.pdf
    • http://gisujug.mypressonline.com/apocalipsis_apocrifos.pdf
    • http://moviesaddaa.online/how_to_color_the_periodic_tableud3wu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dbf456d2-e85d-48da-838b-8b5afb1789e0/regarder_warm_bodies_streaming_vf.pdf
    • https://s3.amazonaws.com/paropabaru/bill_wilson_emotional_sobriety_the_next_frontier.pdf
    • https://uploads.strikinglycdn.com/files/249c29e7-f557-42eb-a26a-671f54a38c58/gojaverazu.pdf
    • http://vexolofifete.atwebpages.com/candida_albicans_treatment.pdf
    • http://kepofif.onlinewebshop.net/5834556016.pdf
    • https://s3.amazonaws.com/wexukufedepim/28747823008.pdf
    • https://s3.amazonaws.com/bomupi/drum_patterns_midi_files.pdf
    • https://uploads.strikinglycdn.com/files/ec276cbb-4b6b-4c51-bd8d-c9834bdd372f/onn_dvd_player_codes_for_universal_remote.pdf
    • http://xomapagovujux.atwebpages.com/33488554057.pdf
    • https://uploads.strikinglycdn.com/files/c0b045db-1f62-4950-b594-8d2ad45ab302/2654773524.pdf
    • http://pojozija.onlinewebshop.net/torelobodupilusisuz.pdf
    • https://s3.amazonaws.com/pirofopafu/journal_voucher_entry_in_tally.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_off0000fbfe.bin
0a3407ff58f3d3a88964503ff4d77c31132d81913d0c062988b539083b93988f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFE 5624 bytes
font_01_sfnt_off00010efe.bin
b078e3789a007dcc1d83388bc33d9e428fb4ae9897251ee0cac3066388dcdb79
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFE 12544 bytes