Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff54de3e54e6222…

MALICIOUS

PDF

78.6 KB Created: 2021-04-30 12:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 31c89702a08df6bc55207a822a192a10 SHA-1: 1109d72870f2fe482b265107bd180742190f4a03 SHA-256: dff54de3e54e6222ff26a4531aa3e74c5d3a965fc5abbe11684f954519e89660
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/strik?utm_term=what+percentage+pass+navy+seal+training PDF link annotation
    • https://cdn.sqhk.co/bowazeduz/ihQrhhJ/resume_template_australia.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/zawewozejopel.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/Ggi0tQn/bumok.pdfIn PDF document text
    • https://pitisugokusibim.weebly.com/uploads/1/3/4/4/134445344/likipi.pdfIn PDF document text
    • https://sajixigepanosu.weebly.com/uploads/1/3/1/0/131070231/teneloze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_43d77e7d61f44688901ab81ac6cf561f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fezenur/dinokiwewajasomatomotetop.pdfIn PDF document text
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_07f037d6feb54121942ae9a1e84df3fc.pdf?index=trueIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_842a1d741fdb49479b7e8515bb1cd0ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca1c47bb-c123-41a5-8c89-6254ba174de5/bejaginifalude.pdfIn PDF document text
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_8a6758b697dd425783ead95e1b3038bf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/savabusamamudatadenud.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/true_metrix_blood_glucose_meter_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/776039cc-3923-4d6b-b698-ee0dbb5f9d6d/what_to_do_if_your_ps4_charger_isnt_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f192d59e-c055-4243-a5ad-48aac398e0ec/87926620252.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24347914-9a87-4918-bc4d-a44463273fff/genutaveputilinidexabik.pdfIn PDF document text
    • https://dfdccaec-9019-42eb-ab8c-14eed22d5f88.filesusr.com/ugd/2e00cc_67ae2919e02f40a4b231c6c9f9fdcae8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/73721782776.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/radio_broadcasting_software.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/safety_gap_analysis_template_excel.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_off0000f4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D1 5372 bytes
SHA-256: 6799692e726f6000c0dcc29e05e83a642cc3988bdbe7bb80e46838ca87a5f107
font_01_sfnt_off00010726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10726 11292 bytes
SHA-256: 7d3909d7e2d17efe45bc9a4ed9da007a57f1f03e997353e73ccfd13d0f4abe3f

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