Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ef98e4b4740ddc…

MALICIOUS

PDF

80.7 KB Created: 2021-10-07 17:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b563dd0b33bdc17c190cf67139c2b090 SHA-1: e5dc503d7a13335c7d0700b4491b66b2f4d2d1fd SHA-256: b4ef98e4b4740ddcd79c1b7ca85763338f889fa5f89d208b68b2368279a950d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs pointing to a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=brazilian+real+to+inr PDF link annotation
    • http://swvocal.com/data/se2/file/42751046148.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/balajafudara.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/janajarorunamemale.pdfIn PDF document text
    • http://tochalco.com/uploads/files/51801673144.pdfIn PDF document text
    • http://htwy.com/upload/file/fefenukupaxivibat.pdfIn PDF document text
    • https://mashura.co/userfiles/files/87811002578.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/95989442325.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/74404378246.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/bapexevanobegolunaja.pdfIn PDF document text
    • http://keyday.ru/files/files/bubevivonu.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/gemupuvi.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cba23ca920---gafisutileviwumewifadu.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/60820168688.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/47947202188.pdfIn PDF document text
    • http://e-menu.hu/editor_up/fobixasa.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/7056783315.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/bifugixalaxovado.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/sibovoxa.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/jifekatag.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/muwakanum.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/72554758526.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_off0000d5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E9 18612 bytes
SHA-256: e81f231907ca7321b082d26724e6b697a42716364629f0d41a3b19bc14e3cbf2
font_01_sfnt_off000106c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDE 10048 bytes
SHA-256: 35d502284ddd08569798064cd83b978938e0aa0dca8c9f64e90eaf4cd9f9c196

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