Malicious PDF — malware analysis report

Static analysis result for SHA-256 188d5eeba275b448…

MALICIOUS

PDF

68.9 KB Created: 2021-05-13 19:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4d8fb17771c398b585d042345ddde847 SHA-1: 524cc2a84bd6cf8562691d8fbd8569e68b34333e SHA-256: 188d5eeba275b448837f93a826fee4c1166a8b47a4b44da87758fe28bd127fd2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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
  • 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://xajibur.ru/strik?utm_term=diagrama+de+fases+de+un+sistema+ternario PDF link annotation
    • http://fijazubelanulek.mywebcommunity.org/pdf_annotation_note_taking_app.pdfIn PDF document text
    • http://kunepuvobimamin.medianewsonline.com/maximum_normal_stress_theory_example.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/bamopikegijufetasowuxev.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/vabijizijonolekimus.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/56776469072.pdfIn PDF document text
    • http://rufawefojag.sportsontheweb.net/rusekefagoruxotinoz.pdfIn PDF document text
    • http://topdiscount.pro/nerabefapuaga00.pdfIn PDF document text
    • http://lemafesopeposuz.mywebcommunity.org/73121633371.pdfIn PDF document text
    • http://mejuzuw.scienceontheweb.net/cake_designs_catalogue.pdfIn PDF document text
    • http://xokapik.mywebcommunity.org/iambic_pentameter_examples.pdfIn PDF document text
    • http://segwaywheelchair.ru/nordictrack_c700_treadmill_motor_beltnc1s9.pdfIn PDF document text
    • http://zonitupupafof.sportsontheweb.net/69988830197.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_18f87c5f50d640f3b243464d69c89cfe.pdf?index=trueIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_26620ff1204045e7a33d22dd5f6ba63d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wavunot/pozowelodujedadokujoga.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/25077659199.pdfIn PDF document text
    • http://doritiwenoxa.onlinewebshop.net/add_text_to_document_online_free.pdfIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_e83764fc7a434f62b4e31314b5cea406.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zosevid/7514942816.pdfIn PDF document text
    • http://tivexedasabuxi.myartsonline.com/74223334823.pdfIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_1be6776f0b624e6d900320f81bdbcff6.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_off0000ce52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE52 5192 bytes
SHA-256: ffa2cf014e1c760f6ae41a505ae82f83382ca3fabdb6e032fffbab52414f53e9
font_01_sfnt_off0000dfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEC 11300 bytes
SHA-256: 67f9753c0c8593deb8297dbf09efbe753f864f4fd561c3c2e529b74ed8e10518

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