Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9f5ce287d78fda…

MALICIOUS

PDF

79.9 KB Created: 2021-03-16 00:44:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4d33736d471e6290d0ceb988d1fe0b9 SHA-1: 9d68f71222c60f3b8af38e31c231648acd55ce6b SHA-256: cb9f5ce287d78fda19ff28d45c5da97abd56e1017b6e2a825805f0aecdb32b1d
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains an embedded URL pointing to a suspicious domain, suggesting a phishing or malicious content delivery attempt. The document body, though heavily obfuscated, appears to be related to a service advertisement, likely a lure.

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://zajinet.ru/strik?utm_term=omnitech+shredder+repair
    • https://static.s123-cdn-static.com/uploads/4428062/normal_5ffed24b7d99e.pdf
    • https://cdn-cms.f-static.net/uploads/4490274/normal_60338a44a2d22.pdf
    • http://kvyovk.xyz/sumog4nhrz.pdf
    • http://kmikaerfs.ru/dirty_pretty_things_band_lyrics4kjvw.pdf
    • http://figejewumoposes.getenjoyment.net/intergas_boiler_manual.pdf
    • https://zewujinewototi.weebly.com/uploads/1/3/4/7/134749630/9758414.pdf
    • http://zawomuxe.iblogger.org/the_book_of_disquiet_the_complete_edition.pdf
    • https://cdn-cms.f-static.net/uploads/4462681/normal_60498d2a79b07.pdf
    • https://cdn-cms.f-static.net/uploads/4467576/normal_5fe7011f1aed0.pdf
    • http://merishwheelrecords.com/due_diligence_checklist_for_buying_a_business_nswj6i95.pdf
    • http://islemleriniz.org/bullworker_x5_manual32cnz.pdf
    • http://vepapin.iblogger.org/busigosa.pdf
    • http://kaboliwup.mypressonline.com/rifudenivadunatekavagus.pdf
    • http://mopewogubit.getenjoyment.net/3029268606.pdf
    • http://jiludedo.iblogger.org/fifty_shades_of_grey_movie_songs_list.pdf
    • https://mirulunus.weebly.com/uploads/1/3/1/1/131164386/bazuzexupiwalumop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b3c1dd9a-47fd-467f-bf11-f6a7d43f22fa/sazobesoponifemetonug.pdf
    • https://uploads.strikinglycdn.com/files/215a8508-a506-4e77-8399-6bc0da53eb71/hallelujah_chorus_from_messiah_lyrics.pdf
    • https://uploads.strikinglycdn.com/files/32207a3d-b1f2-4cba-a2a7-d5cb4ae7f33c/1603837473.pdf
    • https://uploads.strikinglycdn.com/files/1eb13a93-675c-489d-81e6-7f43a108002a/94529962355.pdf
    • http://zamutodud.rf.gd/49405710577.pdf
    • https://uploads.strikinglycdn.com/files/fd4c00e2-80b9-4100-9ec3-ed7c7b0a7107/jenadut.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_off0000f956.bin
d83ceea620fe51700ac4556f1079116bc6f52f24cdba919c9f36c7a28838d7c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 5308 bytes
font_01_sfnt_off00010b2f.bin
1f68cdb64f2c12cff25dec42c6f30d07319441b979032476b10d08b055acefb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2F 10928 bytes