Malicious PDF — malware analysis report

Static analysis result for SHA-256 825a4f32c6c863b4…

MALICIOUS

PDF

82.3 KB Created: 2021-02-22 15:21:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 846f78955be20ab4585e5456e22cca8c SHA-1: bdbe8ec8d4ff135208a41b9fbf3eb27861656137 SHA-256: 825a4f32c6c863b40e85739259cbe33dd3a3fa4053f1eee180ebb3b170acea39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical detection for a link farm and a high ML score for maliciousness. It contains numerous external links, with one specifically pointing to a URL associated with SEO manipulation. The ClamAV detection further supports its malicious nature, classifying it as a phishing trojan.

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 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.
  • 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://bologen.ru/123?utm_term=what+happened+to+leon+in+the+tattooist+of+auschwitz PDF link annotation
    • https://vafadujujuzigub.weebly.com/uploads/1/3/5/3/135312713/257ee2.pdfIn PDF document text
    • https://rawuwivusezorom.weebly.com/uploads/1/3/1/4/131406564/5422583.pdfIn PDF document text
    • https://cdn.sqhk.co/vekasurox/RUMUao8/babefoniwazavopi.pdfIn PDF document text
    • http://instasale.company/frontline_commando_d_day_apk_modbah36.pdfIn PDF document text
    • http://raffle.website/jopesipirixje0.pdfIn PDF document text
    • https://mokakabatedi.weebly.com/uploads/1/3/5/3/135300589/7afcc7.pdfIn PDF document text
    • http://arm-watch1.club/4723300868759dov.pdfIn PDF document text
    • https://tevukebejesa.weebly.com/uploads/1/3/2/6/132695492/50ab3fd261fc.pdfIn PDF document text
    • http://furniture21.online/types_of_supply_chain_management_pptujhre.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gavobawum/tofuginodudolazo.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/pogil_kinetic_molecular_theory_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/curriculum_vitae_example_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/53333595807.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_off0001034c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 5304 bytes
SHA-256: 53581ce617c99150e5732931b490d004da71b13b96e0100ff09aa5cee49ee465
font_01_sfnt_off0001157d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157D 11360 bytes
SHA-256: 19a640ecd25a42b97c50e5901d2aebacaca76769a0f0bbb45a66a43f52bdb757

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