Malicious PDF — malware analysis report

Static analysis result for SHA-256 28cf392feab63bfe…

MALICIOUS

PDF

79.3 KB Created: 2021-02-16 09:48:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f833d069618a5b77f7415de9bd69d7bd SHA-1: 9b48d9908171f82af3dc4dd8018b257edd9a6b59 SHA-256: 28cf392feab63bfe4024b8947327ef124bf98ba97ead464bb90638f8be834e1d
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating an external URI, which points to a suspicious URL. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or trojan delivery. The document body, though heavily obfuscated, contains text related to setting a clock alarm, which serves as a lure to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/123?utm_term=how+to+set+alarm+on+capello+tune+clock PDF link annotation
    • https://cdn.sqhk.co/kosifodalab/T83hcjf/open_laparoscopy_recovery_time.pdfIn PDF document text
    • https://cdn.sqhk.co/jafipago/kUhcDAu/gilejexewixotadoti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423443/normal_60248e7e7ae2e.pdfIn PDF document text
    • http://degunoneb.iblogger.org/thule_roof_rack_instructions_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/vufuvevu/YHLfEjc/51348009685.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454289/normal_6011def53ec93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380380/normal_6001ec15233aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412593/normal_5fcfe7dc941f2.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/gi5zsha/boku_boku_hile_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369911/normal_5fe428cdbfde6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/werowibovezoje/korecall_standalone_phone_recorder_with_answering_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/wowonesoribu/irregular_verbs_worksheets_grade_10.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/83192430265.pdfIn PDF document text
    • http://juxudawalugevop.epizy.com/67297564895.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/pejamawanara.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/appsc_group_1_prelims_answer_key_2019.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA0 5028 bytes
SHA-256: 160dd938a24373d6d3cb97bb70b80bd4af68016f2b1b61d336bd991fdc361ff4
font_01_sfnt_off0000fbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB3 11124 bytes
SHA-256: 83ea16d17748c07617b92700f31bcd9c9ad2c83e21836b42f6261b0c0a6754f8
font_02_sfnt_off000121a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A5 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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