Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5292ea0a788a5e…

MALICIOUS

PDF

72.7 KB Created: 2021-05-15 15:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: afc02f08fc2271b4f04ab93e04e77279 SHA-1: 98734884d0856a2b03036543a6c1b9198de48d2b SHA-256: 9a5292ea0a788a5ed324da832e30c9b35e9ab8890e0e1533d60eb7dfd6d04bd9
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan distribution. It contains numerous external links, with one prominent URL being https://pelibifir.ru/strik?utm_term=grade+5+math+workbook+answers, suggesting a lure to download further malicious content. The presence of many links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://pelibifir.ru/strik?utm_term=grade+5+math+workbook+answers PDF link annotation
    • http://suvekitubexeso.getenjoyment.net/10258464884.pdfIn PDF document text
    • http://buvalopexur.mygamesonline.org/43509173346.pdfIn PDF document text
    • http://nituzovido.getenjoyment.net/ubee_ddw36c_wifi_password.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tebaxisabajix.rf.gd/how_to_remove_plug_from_browning_bps.pdfIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_628741e94b4c4a83ba085e76070996e0.pdf?index=trueIn PDF document text
    • http://bosagiriwamokin.onlinewebshop.net/72796683529.pdfIn PDF document text
    • http://jogilajixetevub.rf.gd/boravux.pdfIn PDF document text
    • http://gumetipazotepeb.rf.gd/il_cantico_dei_cantici.pdfIn PDF document text
    • http://lurolubudoruk.onlinewebshop.net/absceso_cerebral_elsevier.pdfIn PDF document text
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_79a06a3530784a509c17bbd0b2c09fef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/pre_b._ed_exam_form_2018.pdfIn PDF document text
    • http://poleworipewiras.epizy.com/swann_4_channel_1080p_wi-fi_security_system_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c38b4873-0671-4ce6-90ba-0213a372a673/stihl_ts_420_air_filter.pdfIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_7cdec2123d1542cebf93e368da536d05.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/956e8b7b-2c2a-4e90-9164-83eab97a3759/dijexezove.pdfIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_544cfacc93eb43e8bd5128b33916d187.pdf?index=trueIn PDF document text
    • http://mifojizu.myartsonline.com/digitech_element_xp_review_ultimate_guitar.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/73027232319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7809f3da-8d9d-43ba-86ac-94f8228a9a7d/68075711749.pdfIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_fa34501e18fd4c80ba5cc4015897fe0b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bce6bc0-dcba-43d2-911a-9dcfd4237493/rexuliwumusubimogik.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_off0000da6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6B 5484 bytes
SHA-256: ef022a0217ef13afa5964c53e4e9dcc0b1007c046d5ebf5afbad69f7d0e79327
font_01_sfnt_off0000ecff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFF 11332 bytes
SHA-256: c8f7d693b96d2a90c9012f5e7fea75ef67f420d476da075302ef9fb355fc766b

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