Malicious PDF — malware analysis report

Static analysis result for SHA-256 4814ca0c37002e7c…

MALICIOUS

PDF

99.8 KB Created: 2021-02-26 08:51:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5b0a3d9d22be89a6943c94ab13e8e48f SHA-1: 8e8d2430b4165107e25905e87631205c6292792e SHA-256: 4814ca0c37002e7c452d0ba04ea54ca6d9473334d3e7c3620b3a167fa13a8fcf
184 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to 'jacksth.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm for SEO manipulation or malicious redirection. The presence of a download button lure and callback phishing lure further supports a malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/strik?utm_term=yamaha+receiver+rx-v677+owners+manual PDF link annotation
    • http://rowowesofazov.medianewsonline.com/81047547138.pdfIn PDF document text
    • http://leqqurint.online/racing_limits_apk1nd2r.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/zofifisewuxejigugusojupa.pdfIn PDF document text
    • http://itrom.fun/fono_ingilizce_gramer_kitabmueua.pdfIn PDF document text
    • http://yoganchik.space/kvs_admission_6_class_2019_online9kul4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375522/normal_5ffe05a3a27ab.pdfIn PDF document text
    • http://nitesufi.sportsontheweb.net/the_land_of_stories_book_2_audiobook_free.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/29819783566.pdfIn PDF document text
    • https://xasigusuvenazuj.weebly.com/uploads/1/3/0/7/130739755/29fed05.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/mopamomojogepinabolor.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/wefadep/livro_antes_de_partir_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/25358519072.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/lyrics_of_7years_old_by_lukas_graham.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/world_of_warcraft_classic_warlock_guide.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_off0001472c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1472C 5484 bytes
SHA-256: ecd7aeaa60620c7e44b9c3b99c7eafe09676d78a9b8ec5b558f60ac7699a64ee
font_01_sfnt_off000159d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159D4 11460 bytes
SHA-256: 18ceeafbc9834915a13fd8e723221c5beebd70867710046ab63ed6ab04cffedf