Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86055b5aae955d8…

MALICIOUS

PDF

75.4 KB Created: 2021-05-07 23:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 608dea39d659bb45ecc5d8445e602bdd SHA-1: 2c1a0bb60fc5bde75bcb80a747a9373ce8ce0a97 SHA-256: f86055b5aae955d85d9ab384333cd715c32afb4db46244166854f24d429580b4
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that directs to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a product manual title, suggesting a lure to disguise the malicious intent of directing users to the external URL.

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://pelibifir.ru/strik?utm_term=insinkerator+badger+1-83+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4473640/normal_5fedb86290664.pdfIn PDF document text
    • http://jirusulixozome.scienceontheweb.net/how_to_solve_a_rubix_cube_step_by_step_algorithms.pdfIn PDF document text
    • http://litvinenko.xyz/nugezijedaroxe6no8l.pdfIn PDF document text
    • http://ulekschool.online/best_internet_service_provider_in_pune_kondhwapzdsr.pdfIn PDF document text
    • http://vozivovog.scienceontheweb.net/68975585548.pdfIn PDF document text
    • http://ninijefaligogi.mygamesonline.org/holt_chemistry_textbook_teacher_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466413/normal_60419b9ebb10a.pdfIn PDF document text
    • http://gonzo-3d.com/lilazuradu0hwd2.pdfIn PDF document text
    • http://russianpatentexpert.com/peace_like_a_river_chapter_17_summary77pe6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418170/normal_5fdc25970c02d.pdfIn PDF document text
    • http://fresh-ita.space/93847062019d6msf.pdfIn PDF document text
    • http://repair-monokoles.ru/wopixeruxudi98o83.pdfIn PDF document text
    • http://ing-cliente.com/medical-surgical_nursing_assessment_and_management_of_clinical_problems_single_volume_10e35vli.pdfIn PDF document text
    • http://smartradiobf.ru/99_acura_tl_maintenance_required_light1u980.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/welanisowari/whos_afraid_of_virginia_woolf_playwright_edward_crossword_clue.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/boomerang_movie_hd_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/93094987555.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/4991031665.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/xowepudebajos.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/15858371583.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/79535125992.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE724 5728 bytes
SHA-256: cbf549692717e60c587afb9c40c27674502a777623ce2f4663a9a5934ca9d7b0
font_01_sfnt_off0000fa9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 10944 bytes
SHA-256: 52b86e81da88b43a1cbb617c8b2501461bce94efe57509b5533c84d341893b32

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