Malicious PDF — malware analysis report

Static analysis result for SHA-256 b300003cbcf3b6c0…

MALICIOUS

PDF

76.3 KB Created: 2021-03-26 08:42:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2d2ac07f9479ad717c91c7661b092675 SHA-1: 60a678f36ce48f6d3b1c4ed7fff71711db4c5e14 SHA-256: b300003cbcf3b6c0fa14439769c12d68ec9e76c9fbcf509a4cc65ae838896ebf
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains or potentially malicious hosts, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document's structure is designed to host many links on disposable domains. No scripts were extracted, but the presence of multiple external URIs suggests the primary goal is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8488

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://xajibur.ru/award?keyword=apostila+mecanica+automotiva+senai+pdf PDF link annotation
    • http://doruguduku.iblogger.org/lajilamezomazigokulod.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvitatutuv/bjggij9/fajoved.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/hgW8p9t/easy_care_pulse_oximeter_ec2520.pdfIn PDF document text
    • http://healthytrands.com/82241790258gzch7.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/8Abibih/69103586528.pdfIn PDF document text
    • https://cdn.sqhk.co/xazururoxe/6heQ2R5/paderuse.pdfIn PDF document text
    • http://kovuguzi.22web.org/towezodo.pdfIn PDF document text
    • https://cdn.sqhk.co/xosuridasago/geZghjE/bujebem.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/why_wont_my_shift_gear_move.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/57920205961.pdfIn PDF document text
    • http://bossyonlinex.com/47227440081iulhv.pdfIn PDF document text
    • http://lapegokexixij.medianewsonline.com/installment_agreement_form.pdfIn PDF document text
    • http://juzagunugix.iblogger.org/adobe_photoshop_brush_tool_free.pdfIn PDF document text
    • http://porizaritofo.mypressonline.com/dokaminapewafot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuzuvulas.epizy.com/cetoconazol_xampu_bula.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/6256433566.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/digazozo.pdfIn PDF document text
    • http://pajupap.rf.gd/basic_digital_electronics_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/jajeralej.pdfIn PDF document text
    • http://wozetarep.rf.gd/longman_academic_writing_series_2_free_download.pdfIn PDF document text
    • http://womejus.rf.gd/anaerobic_respiration_fermentation_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/tamovagag/balance_sheet_sample_ifrs.pdfIn PDF document text
    • http://gonurorirezode.epizy.com/english_speaking_practice_software_free_download_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/grid-_template-_columns_not_working_in_safari.pdfIn PDF document text
    • http://raxajabidadida.onlinewebshop.net/28031457003.pdfIn 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_off0000f79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79D 5252 bytes
SHA-256: 5d9c30df5a34949495a47b02f7f0d65e45b3296ee2f63981f522adf2b083ee8d
font_01_sfnt_off00010976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10976 13576 bytes
SHA-256: 1f19451f254b474b51e0406c73ced41781bf504da3bee5f7595c201c3b876565

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