Malicious PDF — malware analysis report

Static analysis result for SHA-256 821e8bcb44e21427…

MALICIOUS

PDF

72.3 KB Created: 2021-01-19 02:00:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 87f6d93c5eafe5fc08109b004d496f6a SHA-1: b9959b94f797923b5d4dc847ee2cf08f0f700295 SHA-256: 821e8bcb44e214272d76063e1b6f1c21c1fbd46f3815f23114c10ae7ab4b1d59
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It presents a fake CAPTCHA to the user, a common social engineering tactic to prompt further action. The embedded URI points to a suspicious domain, likely serving as a lure or part of the attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://jottigo.ru/123?utm_term=aw55-51sn+rebuild+kit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452382/normal_5fa7d37a5ee3f.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/Shjidoc/gevivekudiza.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/8hcUTUn/nhl_schedule_today_espn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451755/normal_5fde73208901b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467306/normal_5fad8ca49bd73.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/fLHlqfh/95215266890.pdfIn PDF document text
    • https://cdn.sqhk.co/vegubefeno/ihnod19/solar_auto_insurance_santa_paula.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421218/normal_5fedcc02021d0.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/1Dyzkvm/63199619910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420244/normal_5fba36c0857b7.pdfIn PDF document text
    • https://maktrans.net/Komplekt-prokladok-AW-55-50SN-AW55-51SN-00-upIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vitusaw.rf.gd/christmas_hymns_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/bethel_reckless_love_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/folabuzin.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/arrange_pages_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/3133613986.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/caida_libre_ejercicios.pdfIn PDF document text
    • http://javasuk.epizy.com/go_effortless_energy_complaints_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/25998836033.pdfIn PDF document text
    • http://gepuxaxevo.rf.gd/nimeloniwakag.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/aws_certified_solutions_architect.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E0 4876 bytes
SHA-256: dfaff8ff694c72c8db2cc7370d7b5ab7db53d24e41b17867d321c426cb8455e2
font_01_sfnt_off0000d999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD999 14468 bytes
SHA-256: 42f4d41141e22393a629926670d740c824796fdd90d956e8ea6225daa6f82c48
font_02_sfnt_off00010642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10642 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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