Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f15ab7c9523871…

MALICIOUS

PDF

85.8 KB Created: 2021-05-20 07:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bd0bbb9411e8a71be7ddbaeb7e67bf44 SHA-1: da609f35cb8c5cd767ac68fd5af448e48adfbede SHA-256: c1f15ab7c9523871eface523438a72eeea6b4a2e7d23b58008900a8c505fcd58
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9996

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
  • 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://maypoin.ru/strik?utm_term=examen+muestra+unam+2018+pdf PDF link annotation
    • https://pasironukid.weebly.com/uploads/1/3/0/8/130814081/2039828.pdfIn PDF document text
    • https://nudatisuwirok.weebly.com/uploads/1/3/1/3/131384101/sodonijisidurekuxa.pdfIn PDF document text
    • https://nosavarugogitov.weebly.com/uploads/1/3/4/4/134488680/metig.pdfIn PDF document text
    • https://menusopam.weebly.com/uploads/1/3/4/5/134597334/wiwetefataket.pdfIn PDF document text
    • https://tadilagene.weebly.com/uploads/1/3/1/3/131381422/5677914e2da7282.pdfIn PDF document text
    • https://mefovisesivem.weebly.com/uploads/1/3/4/5/134525463/2358159.pdfIn PDF document text
    • https://doliwalesi.weebly.com/uploads/1/3/0/7/130776147/regixasif.pdfIn PDF document text
    • https://vakexojukesazi.weebly.com/uploads/1/3/0/9/130969985/155545.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/baritexovopa/stroke_guidelines_carotid_endarterectomy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff497a02-0893-4269-910e-2aae2424141a/35604335552.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/polycom_soundstation_2_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/buzz_lightyear_pumpkin_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/system_of_caucasian_yoga.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/ruzezorarijave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/765d05c4-387e-4430-b09a-6ce09bddb638/best_online_spoken_english_classes_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/dazawojob/catholic_answers_magazine_promo_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c747c483-c5d2-4d3b-99f8-2efa1164c746/zondervan_niv_study_bible_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cca0b2e0-8d43-486e-ac71-23d91f8be969/97437400674.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/33945789852.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/89436167505.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/honda_rebel_250_carburetor_diaphragm.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/ap_seminar_iwa_examples_2020.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_off00010ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA8 5700 bytes
SHA-256: 018547d00ce60cf7d54488788df64b0b92ddf2fbfa13901df2ebabe8d1750a00
font_01_sfnt_off00012001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12001 12644 bytes
SHA-256: d0917478926c313d6d2911c80a9e28602d1232f4b558b96a322d6efec898af06

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