Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1d8699c43a7806…

MALICIOUS

PDF

114.7 KB Created: 2021-03-18 21:34:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 29d3553ddfe91a76b8c55dd1d019e230 SHA-1: b060c835451e88fc0dcbbed4a66f01fd6e90cd43 SHA-256: 3a1d8699c43a78060fd2ffcd29067927eb2e61ae8653efb8e67f6d92222db28d
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics identifying it as a malicious redirector and a link farm. The primary malicious URL identified is 'https://crophysi.ru/123?utm_term=artritis+reumatoide+juvenil+sistemica+pdf', which is likely used to lure victims. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=artritis+reumatoide+juvenil+sistemica+pdf In PDF document text
    • https://tudaluvakagovax.weebly.com/uploads/1/3/4/6/134614365/piderebuzozipi.pdfIn PDF document text
    • http://belkwigs.com/hodder_igcse_physics_workbook_answerf9ywn.pdfIn PDF document text
    • http://povar2020.site/gegajowojzbiji.pdfIn PDF document text
    • https://lejegibovijidup.weebly.com/uploads/1/3/1/4/131438293/7e30abbfae41.pdfIn PDF document text
    • http://wisatemubudu.medianewsonline.com/13222232773.pdfIn PDF document text
    • http://itawomen.fun/lugumuxebugij1k9c7.pdfIn PDF document text
    • http://xukosususif.medianewsonline.com/where_is_the_battery_located_in_a_2020_chevy_traverse_2011.pdfIn PDF document text
    • http://dejevixumuvele.22web.org/manual_biomagnetismo.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/nevapufixuzoli.pdfIn PDF document text
    • http://worajovijize.22web.org/6532972386.pdfIn PDF document text
    • http://lozipazom.sportsontheweb.net/social_contract_theory_examples_in_the_philippines.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/dowadotiju/final_fantasy_13_ps3_trophy_guide.pdfIn PDF document text
    • https://dce09894-55e7-49e1-9c43-b94069c58f23.filesusr.com/ugd/11ae40_f1367dc3e5e340e2b6c87997a9b4f1fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/pound_to_kg_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/school_admin_job_interview_questions_and_answers.pdfIn PDF document text
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_d718051ee4d0495a8e2806ba9bde8af3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/53032930814.pdfIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_31ccd90f64bd4814b3d9b9bd62a4838b.pdf?index=trueIn PDF document text
    • https://6448a590-b571-4b71-a9e4-820b8531b153.filesusr.com/ugd/782be2_7c33c4b02dc54198a818781f69a203d0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/belozubirudom.pdfIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_1c1af57320f943449dfb2a80e27b9a10.pdf?index=trueIn 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_off00017ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FFE 5424 bytes
SHA-256: 4c965b6de74e2831921bd3f0335477c0279757ea16c6c0e105a4697e9f356af9
font_01_sfnt_off00019267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19267 12744 bytes
SHA-256: 10507295236621cf72e73b4905747a86b86ee01ae4b6613f76059a0c433ece1d

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