Malicious PDF — malware analysis report

Static analysis result for SHA-256 a871d3923a72a34a…

MALICIOUS

PDF

81.8 KB Created: 2021-03-13 22:03:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89ae36d48077d019012eae72a3327e30 SHA-1: 1acc1f11d0374dde844ab654f82ac028d2d3dd6b SHA-256: a871d3923a72a34aab7f9742b2a5960ff96a541c6805a4cc19de69d2c3eea12e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains an embedded URL pointing to a resource disguised as a typing tutor book. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/123?utm_term=english+typing+tutor+book+free
    • https://cdn.sqhk.co/fawabanof/cEZiigf/spiral_jump_ball_program.pdf
    • https://cdn-cms.f-static.net/uploads/4446512/normal_6046ee99ac74b.pdf
    • https://cdn-cms.f-static.net/uploads/4422372/normal_603c2a2f17023.pdf
    • http://goranefadosire.iblogger.org/98097203886.pdf
    • https://static.s123-cdn-static.com/uploads/4381531/normal_5ffb2068970c4.pdf
    • https://cdn.sqhk.co/nipigagavadu/eifhcPp/gabagokalo.pdf
    • https://cdn-cms.f-static.net/uploads/4462066/normal_600c6d934d4a2.pdf
    • https://cdn.sqhk.co/sufiwotag/BgehaKD/disco_duck_song_lyrics.pdf
    • http://bedomukuruxe.22web.org/classification_of_organisms.pdf
    • https://cdn-cms.f-static.net/uploads/4370076/normal_6042fc7592288.pdf
    • https://cdn.sqhk.co/wixefawoz/ihd1Kjc/30543311391.pdf
    • https://static.s123-cdn-static.com/uploads/4366336/normal_5ffe95f9b30c0.pdf
    • https://static.s123-cdn-static.com/uploads/4374542/normal_5ff32800cd662.pdf
    • https://cdn-cms.f-static.net/uploads/4462696/normal_603763755c5b0.pdf
    • https://static.s123-cdn-static.com/uploads/4419412/normal_5fc9ac01536a5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tuwutexo.onlinewebshop.net/polar_bear_population_2009_vs_2019.pdf
    • https://uploads.strikinglycdn.com/files/866dba11-6335-478b-9a5d-3d77304dc42e/narcotics_anonymous_12_step_program_workbook.pdf
    • http://gepivefukusi.atwebpages.com/nifaza.pdf
    • https://uploads.strikinglycdn.com/files/42c98b4b-9946-4630-b8ea-590b6a0f5738/26831787517.pdf
    • https://uploads.strikinglycdn.com/files/4855f9e9-2eda-447b-ac44-8970d46235c3/mozewawotibimote.pdf
    • http://midelex.epizy.com/74346777281.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_off000102b3.bin
a456a24e8cedd459d7926d9c418f7417cc24473a552fe2872dc2c34f16ca8fd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x102B3 5216 bytes
font_01_sfnt_off0001147f.bin
60f75aa24bcaf07fcea575bebde1d029d481cff9497f15176d33f86995a269cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x1147F 10564 bytes