Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21261b6b7b63d80…

MALICIOUS

PDF

76.8 KB Created: 2021-05-03 12:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3a8f06c5f1d7352362ecd66bf53c2718 SHA-1: 9e6e6d6202ecf24be50abf404b32db313c631262 SHA-256: c21261b6b7b63d80c585e2ba2bbf1b5a3c1ffed4f1f8648233243c086e210c8c
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('jacksth.ru') that is likely used for malicious redirection or phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host many links on disposable hosting, further supporting a malicious intent.

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
  • 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://jacksth.ru/strik?utm_term=is+yaddle+in+the+mandalorian PDF link annotation
    • http://kokolonesafu.getenjoyment.net/tarirojanogufojogalot.pdfIn PDF document text
    • http://marketeuro.pro/158889075344y837.pdfIn PDF document text
    • http://risurevisawibe.iblogger.org/epf_kyc_form.pdfIn PDF document text
    • http://giwitijudaleka.mygamesonline.org/guzabefixopunumomin.pdfIn PDF document text
    • http://vykupavto54.ru/meyer_e47_pump_cover240pw.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/garmin_dash_cam_55_specs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_56906d85081643b1b2537d76ab9cf9b3.pdf?index=trueIn PDF document text
    • http://pepawelifebin.rf.gd/dibrugarh_mohanbari_weather_report.pdfIn PDF document text
    • http://nuvebabe.atwebpages.com/andrew_wommack_a_better_way_to_pray.pdfIn PDF document text
    • http://gagodat.rf.gd/robbery_bob_2_mod_apk_techylist.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/saga_cazadora_de_hadas_3.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/vafinixifekixuro.pdfIn PDF document text
    • http://zusobudem.epizy.com/10622431315.pdfIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_75972c675ada4135973bd213d5349214.pdf?index=trueIn PDF document text
    • https://8df9d1b7-8f6e-49e1-bdac-c9da4d4291fd.filesusr.com/ugd/12c198_326c53607d8543758d3c506bc5363026.pdf?index=trueIn PDF document text
    • http://lajimaju.epizy.com/possessivpronomen_latein.pdfIn PDF document text
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_633683cce891494db690abc1078677b8.pdf?index=trueIn PDF document text
    • https://7980b0ff-2efe-48f4-a442-6c87bca80713.filesusr.com/ugd/9bd8c3_20a144f31d3141ebb5bed3ba34c21024.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/guided_by_voices_lyrics_game_of_pricks.pdfIn PDF document text
    • http://kegogoxuxupi.rf.gd/human_centred_design_toolkit.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_off0000ed32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED32 5104 bytes
SHA-256: d59d0d9ac479d31448b8d25def5e2447816e7a66c13a9485913ebdef8b59a9cb
font_01_sfnt_off0000fe64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE64 11300 bytes
SHA-256: 470fece53e571b7bd4189a57b497136dc0c486b015debb010a15d519e682c648

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