Malicious PDF — malware analysis report

Static analysis result for SHA-256 56dd01243ba978bf…

MALICIOUS

PDF

80.8 KB Created: 2021-03-21 08:40:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ca1ac8545eb2d6fc7f1b56f78dbd1aef SHA-1: 447d624a7a1c8902c7fedf0e0adbf7279193e57d SHA-256: 56dd01243ba978bf969cbca21913e17c486ffed3a0e7f3e3bcf4064efc6928b8
126 Risk Score

Malware Insights

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

The PDF file contains numerous links to disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs, such as https://kuzutuzo.ru/strik?utm_term=how+to+get+rid+of+acne+scar+fast, are used to lure victims under the pretext of providing information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=how+to+get+rid+of+acne+scar+fast PDF link annotation
    • https://rafunukogavukuj.weebly.com/uploads/1/3/3/9/133999746/badibutukifafewilifo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497369/normal_600309c71878d.pdfIn PDF document text
    • http://stroiline74.ru/what_is_the_number_802_mean5kpio.pdfIn PDF document text
    • http://keto-menu.online/how_do_you_sing_in_spanish6x57z.pdfIn PDF document text
    • http://genoray.pro/brandy_cinderella_movief69t1.pdfIn PDF document text
    • http://verification-help.business/hachiya_persimmon_zonevosu9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421781/normal_6042129e46d7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370266/normal_60437f45a423d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468540/normal_602ee63121eea.pdfIn PDF document text
    • https://zeteparikimifol.weebly.com/uploads/1/3/1/6/131637109/vokowekikegugosasevi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404523/normal_60568a40cc2e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407064/normal_5feb2501f0825.pdfIn PDF document text
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/67cdeecb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nugifola.rf.gd/98078583100.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/tomikenap.pdfIn PDF document text
    • http://wonegesaf.epizy.com/kefijip.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/17593551673.pdfIn PDF document text
    • http://kinutumuzikuji.epizy.com/nadaz.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_off0000fc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6D 5212 bytes
SHA-256: 5fe008c2cbe523e7f4b9f2eaaf2d7a6c8b7d7212c7fd7dce0b45309172ac58e0
font_01_sfnt_off00010e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4E 11936 bytes
SHA-256: a531653f45a2c2acf571a28c37b3182d24f71d264a038fa6a26a73156d8259e3

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