Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c869cd6753b51e0…

MALICIOUS

PDF

85.2 KB Created: 2021-09-09 08:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 6f47553be960c48808d82a7ac641a5f0 SHA-1: 2e7a444e187b4310bd36dc9c4fdb67d13e7a6ce4 SHA-256: 0c869cd6753b51e05e994840bdfddbfb0ad8928f88067ea130251884eb52183d
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 0.9860

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 http://kimkhimientrung.com/uploads/image/files/vibirojasavib.pdf In PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/nagasunasarobiz.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/lonebumerapogixo.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/takabo.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///borilefisatev.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/diwevuv.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210906072155.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/sitafemabadadanopizojenid.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/8571161577.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/1964138622.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/gopezedajajunuwanikusoz.pdfIn PDF document text
    • http://mobilenmr.com/files/files/fitasedomimelivowavat.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/nufagusosamitupakefeni.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/31314928318.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/88463889712.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/12369918016.pdfIn PDF document text
    • http://4rrecycle.com/files/file/87991165489.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/wikewofitibugigax.pdfIn PDF document text
    • https://brakos.it/file/62532583470.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/xulurorinef.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/wosufiwodemalonax.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/nuzegipo.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/pemovig.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/rimimubexatoxetoxodakediz.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/dugototeme.pdfIn PDF document text
    • http://z500.si/files/piwemuferetelozogij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=live+cricket+tv+hd+apk+free+downloadPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 18288 bytes
SHA-256: 0153542d78767c9c4a573717ae99f2a7a788a1e2742b2de8360c8e8b9d82f850
font_01_sfnt_off000116bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED2 10748 bytes
SHA-256: a7dd2862aadfc05facb7bfbdc9f6cdb5613d2ad5008b0c84e8edf45da9d5808b

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