Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4c5aa99759874c…

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 20:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ca5f723b29c493ad018e4c11e1f6f26c SHA-1: 13e8c0dedb7673df723054d4a0f06ca95b9d8023 SHA-256: 3a4c5aa99759874cfcb16bd66a001c093c2dc2ded0d1c0b57cd25c31e5627d62
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and a heuristic firing for MFA/one-time-code harvesting, indicating a phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated, but the presence of external URIs and the phishing lure point towards an attack pattern designed to steal user credentials or session tokens.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://smidgel.ru/uplcv?utm_term=hard+reset+a+tablet PDF link annotation
    • http://ariogalospspc.lt/userfiles/file/katepeju.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/zuferunawafuzijatan.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/1966108324.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/73889900154.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/1523429096.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/zefisalakabifavaki.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/vivegizugekugilubominewa.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/mujapazuzujofebadi.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/49938913857.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/39711154972.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136b3335088b---82798227812.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/86994567246.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/67490869180.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/xujowabegipupunukoj.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/63178877953.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/darivijofewapilag.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613e850ab65aa---67217463118.pdfIn PDF document text
    • http://ashioke.com/images/library/File/kotifivonowag.pdfIn PDF document text
    • http://www.heksan.com.pl/file/junufazikijusatuxudo.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/69110129423.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/12692430951.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/wizowejanexi.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/sugevipuwip.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_off0000d8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 10056 bytes
SHA-256: 9d182118a26aed077ab11d5033c508f31ac196a71053a634de7b1a4966c3091b
font_02_sfnt_off00010762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10762 17952 bytes
SHA-256: 1bc7f1c963f710aa98e8c66c5855e687b1c8a92290fec67f4e519489dffddf14

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