Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9020dbfe557b416…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 02:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 77591d9256c22c554b46f7b6fadb5670 SHA-1: c32e624e8965bce8dd81d504b6da8953c6e33af8 SHA-256: c9020dbfe557b41656745541de728e52b84e4c01f9b1d7a250dfd6cc74c934f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. The primary function appears to be redirecting users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=galaxy+tab+s2+screenshot PDF link annotation
    • http://timebymtm.com/upload/files/vosukidekus.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/32639225824.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/vewilezupefarirepizigisux.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/20972597847.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/lenukurapedivaruvefumut.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/32175866969.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/nubavujojagevasozemebiz.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/jokosofewakitatiteka.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/boxamu.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/40398834460.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/82444737203.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-9/20210909235246355529.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/61574989477.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/risedup.pdfIn PDF document text
    • https://wita.lt/images/files/tokadurudelujidikemarewid.pdfIn PDF document text
    • http://htwy.com/upload/file/zakubogovoko.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/papav.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/98024718865.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/disepogutemamegizugukifij.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399110a81ca---74723011152.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/37628979654.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/57386982864.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/95863582334.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://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_off0000da2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2C 18280 bytes
SHA-256: e7c57dafa0fa07f72de61679e08df9199846859bed851414acb6131c0262bd46
font_01_sfnt_off00010a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1D 10748 bytes
SHA-256: 469ecd720d37536e2ad71f307d3c825250be3541543e1ec78d4774206af67575
font_02_sfnt_off000122f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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