Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc5328a5f7ec943…

MALICIOUS

PDF

173.7 KB Created: 2021-02-24 13:14:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cd183a86b365cd765afae007e5e8c75f SHA-1: d34017e364a2791ed938b7d1d6d9079dc63b16af SHA-256: 5dc5328a5f7ec943af6acc78c64fa3f7dec287621da98af81e814314064eed26
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominently featured in the document body disguised as a search result. This URL, 'https://jottigo.ru/strik?utm_term=what+is+the+best+mod+manager+for+fallout+new+vegas', is likely intended to redirect the user to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=what+is+the+best+mod+manager+for+fallout+new+vegas PDF link annotation
    • https://ripumunilemaz.weebly.com/uploads/1/3/5/3/135302863/reguxomodapo.pdfIn PDF document text
    • http://gagefepinulivaf.iblogger.org/unspeakable_joy_douglas_miller_sheet_music.pdfIn PDF document text
    • http://gegejobusi.22web.org/57093466496.pdfIn PDF document text
    • https://miwevedadig.weebly.com/uploads/1/3/1/4/131437981/f92137b4df653e.pdfIn PDF document text
    • https://xowimigijik.weebly.com/uploads/1/3/1/6/131637135/rofexofitujukifowusi.pdfIn PDF document text
    • https://razamilijukiw.weebly.com/uploads/1/3/4/8/134879964/kewikop_voxutowibigabur.pdfIn PDF document text
    • https://wazaxilam.weebly.com/uploads/1/3/4/7/134726650/409079b8.pdfIn PDF document text
    • http://nubenukarerira.22web.org/jorutufibitogomugamutapol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/28425143422.pdfIn PDF document text
    • http://gazinopalevigem.rf.gd/nutexotisevukun.pdfIn PDF document text
    • http://porojerosisogu.rf.gd/universal_kathisma_2019_songs.pdfIn PDF document text
    • http://rigutogivopum.epizy.com/lagu_gloomy_sunday_original.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_off00026f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26F06 5628 bytes
SHA-256: 0eed3c3bbf8768209ae57849d7cfe5d9cd08f8f866c03bbec599655721a93ab6
font_01_sfnt_off00028218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28218 11492 bytes
SHA-256: 86688824a61ae4879fc3f794eba65c6ec186fbbad2584197faa7228b857b6f03

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