Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a9761cdbbc83e5…

MALICIOUS

PDF

80.1 KB Created: 2021-03-19 03:35:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f44474a2efaf255301fd6619bc458ae8 SHA-1: 77852ef906ab5b79247abe750a4ac308cb168a79 SHA-256: 90a9761cdbbc83e5748e629a6d7d9f0f1a4c8d41ef13f077ce87676a319d4f78
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDFs, indicative of a link farm or phishing campaign. Heuristics indicate an advance-fee scam lure, suggesting the document's content is designed to trick users into believing they will receive a prize or parcel. The presence of multiple PDF links and the ML classifier's high confidence score support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://botokaw.ru/aws?utm_term=what+color+is+your+parachute+2020+ebook
    • https://cdn.sqhk.co/rebibenizuj/hfjgDhg/26573827142.pdf
    • http://nitafibejuze.mygamesonline.org/retifakudodufisexazapuku.pdf
    • http://togurebuk.66ghz.com/60411046225.pdf
    • http://nopuvobetag.mygamesonline.org/air_freight_logistics.pdf
    • http://wupidubame.mywebcommunity.org/wasted_years_guitar_tab.pdf
    • https://cdn.sqhk.co/kigowabalo/x9miart/97443582070.pdf
    • https://danaguvofuboxi.weebly.com/uploads/1/3/5/4/135401293/suladabesase.pdf
    • http://peluxuba.sportsontheweb.net/different_types_of_costing_methods.pdf
    • https://cdn.sqhk.co/wibezudak/sjhhgia/motorcycle_trailer_rack.pdf
    • https://goxejebifebiv.weebly.com/uploads/1/3/2/6/132682819/jesoluja-zewidilagejer-wivobekonu-rufadaje.pdf
    • https://cdn.sqhk.co/liregagibago/gfWlhhv/uae_exchange_rate_pound_to_pakistani_rupees.pdf
    • https://cdn.sqhk.co/pitadewedobu/q8jhchh/real_air_force_ones_vs_fake.pdf
    • http://wekanisa.scienceontheweb.net/daxemizifedikamu.pdf
    • http://kizidotiz.iblogger.org/73011023961.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kunopeto.epizy.com/77698911856.pdf
    • http://senesijosezetu.myartsonline.com/rumalivukubagam.pdf
    • http://lawupoxag.epizy.com/supervisor_interview_questions_and_answers_examples.pdf
    • http://nozozuwovore.atwebpages.com/how_to_test_a_faulty_diode.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6bb.bin
2b4266403614e0996ea1679b06261f4091570526941adf36eb60ee6d43077452		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BB 5616 bytes
font_01_sfnt_off000109dd.bin
43977cbec170269c8c63f9553733dfc3aed3d8101ba0bcd641c69c61560bad7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109DD 11868 bytes

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