Malicious PDF — malware analysis report

Static analysis result for SHA-256 e062439a2c8a3729…

MALICIOUS

PDF

87.0 KB Created: 2021-04-02 20:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13a3c0c129c38f0ea5bd302394b1d414 SHA-1: 79e276b9f43ba41ad60d16b4724e64622cabba18 SHA-256: e062439a2c8a3729acc7e6a315ad1d0f846cc1b5112c2538c84ccb99d55fc9a3
134 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many hosted on disposable domains, indicating a link farm designed to obscure malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading malware via the embedded links. No scripts were extracted, but the PDF structure itself is indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/award?keyword=navodaya+application+form+pdf+2020+20
    • http://sakulog.sportsontheweb.net/vitamix_e310_explorian_blender_professional-grade_48_oz._container_black.pdf
    • http://kojijeku.mygamesonline.org/80627452297.pdf
    • https://ganalazukomej.weebly.com/uploads/1/3/4/7/134714395/13dac3.pdf
    • http://tinutig.22web.org/cursive_writing_practice_sheets_for_2nd_graders.pdf
    • http://jivevoradoto.22web.org/mazimivovokivenoroxenepib.pdf
    • https://mazokaru.weebly.com/uploads/1/3/5/3/135303974/xepuviwa-foxatojesa-mapekewujur.pdf
    • https://zugimawaxudal.weebly.com/uploads/1/3/1/4/131410952/7665590.pdf
    • http://lijonotogi.scienceontheweb.net/hoover_windtunnel_max_uh30600_manual.pdf
    • http://manapuzasupin.sportsontheweb.net/surah_yaseen_shareef_download.pdf
    • https://cdn-cms.f-static.net/uploads/4367944/normal_6063504906e3c.pdf
    • http://fibisazorowax.mypressonline.com/child_development_and_pedagogy_in_tamil.pdf
    • http://nemagufi.mywebcommunity.org/9th_grade_math_word_problems_worksheets.pdf
    • https://dirixiganud.weebly.com/uploads/1/3/4/3/134321978/wevumifitom_remakunufufe_jetele.pdf
    • https://cdn-cms.f-static.net/uploads/4494888/normal_5fd3166dd2362.pdf
    • https://zanudega.weebly.com/uploads/1/3/1/1/131164011/tesimutu_dasogev_sulebujo_besuwejadanux.pdf
    • https://cdn-cms.f-static.net/uploads/4371808/normal_601281c1dbeac.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://wudazebej.atwebpages.com/animal_kingdom_classification_download.pdf
    • http://bamonoxo.onlinewebshop.net/24167170742.pdf
    • https://uploads.strikinglycdn.com/files/1581fd85-8338-40f1-95bc-9bbc01b01a9f/3606447570.pdf
    • https://uploads.strikinglycdn.com/files/fae82017-cf0c-4e20-8c8c-4419c36bc79e/ribinojepurenujosukavir.pdf
    • http://watotiwima.rf.gd/62589459688.pdf
    • http://zexubuwebujuk.rf.gd/adoption_ontario_information_session.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104ee.bin
ed2af532c66a9ef381f02dd31ced782cf5956707cf18ae78c00331ed09fafd53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104EE 5528 bytes
font_01_sfnt_off000117c1.bin
053af20543e8edd823234adec08fb9c7afa2665fe2486f230f5d1ffed0bd2abe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117C1 11188 bytes
font_02_sfnt_off00013de7.bin
53d91ddd9decfb60e930907b8ed9a1849e5f4feecfc76eb424ccc02fc2b07ead		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE7 4468 bytes

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