Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd10c59bbcaee681…

MALICIOUS

PDF

76.8 KB Created: 2021-04-06 02:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f5cda9df89bcec70b9bc8cfb6e32687f SHA-1: b362cd010b9e0b3f7f4d0b5b2d8541aed2e19564 SHA-256: cd10c59bbcaee681b6de0793daf7f674b36d6aba4fcf08786bc80c5e2b072523
154 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by a machine learning classifier. It contains a link to a known malicious redirector, dafemum.ru, which is likely part of a phishing campaign. The document body, though heavily obfuscated, appears to relate to printer setup, a common lure for technical support or driver download scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://dafemum.ru/strik?utm_term=hp+officejet+pro+8500+premier+wireless+setup In PDF document text
    • http://zodatowafe.getenjoyment.net/ponigozowugimelun.pdfIn PDF document text
    • http://easterthjg.com/best_rate_new_yorker_subscriptionma0ug.pdfIn PDF document text
    • http://moresukko.ru/traducir_espaol_ingles_con_camaraik09i.pdfIn PDF document text
    • http://topuniversityru.fun/dewiborib6ovm.pdfIn PDF document text
    • http://lami-lashes.site/32750912444bax58.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wadoromutisagar.myartsonline.com/61078262860.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/kemipekebazozetesasum.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/free_father_christmas_letter_template_uk.pdfIn PDF document text
    • http://kerexiref.onlinewebshop.net/safety_technician_job_description.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/australian_ethical_fashion_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/xodigemokebulajaja.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/battle_of_dazar_alor_raid_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/murivasumegaje.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/what_is_the_device_used_for_morse_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a1cd611-e5f8-4f4b-887d-a036233fa35d/fedoket.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/nigan.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/how_to_use_formative_assessment_in_the_classroom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4348607-ce8e-42bd-9457-d0306f8f361e/coleman_catalytic_heater_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88C 5540 bytes
SHA-256: 1b821141e8d132cd3fb39bdb3ede71c2b6da6b5083ddb81ba11a6f994e139e38
font_01_sfnt_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 10292 bytes
SHA-256: 89f564e9531df8d69c6428b70367ecd3853cb3e50a5edfbb4800fa96e0e6bbdf
font_02_sfnt_off00010ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBB 16616 bytes
SHA-256: 1b2ba628f786a6a53a2e347e0c4424ff2728452c1f162074ac3e64c6542c501c

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