Malicious PDF — malware analysis report

Static analysis result for SHA-256 818eb45ee029ab8f…

MALICIOUS

PDF

84.2 KB Created: 2021-05-25 15:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 846763fae9cbbaf4b7c8fea9a3cb1bd1 SHA-1: 795cf5a08ee2a7644e2874cfbabfb8f177800fae SHA-256: 818eb45ee029ab8f56f744559d6e572fe08b3c5282d281c92da0460609fed4f2
136 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to a malicious URL. The embedded URL `https://jacksth.ru/strik?utm_term=partitura+tico+tico+no+fuba+clarinete+pdf` is identified as an SEO redirector for free download phishing. Although no scripts were explicitly extracted, the PDF structure and the nature of the embedded URLs strongly suggest a phishing attempt designed to trick users into downloading potentially malicious content or visiting a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=partitura+tico+tico+no+fuba+clarinete+pdf PDF link annotation
    • https://nisuwifa.weebly.com/uploads/1/3/1/4/131453943/wixanaxoraxa-sezulaxoxeja-tovetonep-modikoba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420589/normal_5fd8873cd10b6.pdfIn PDF document text
    • https://givebuzuwipagin.weebly.com/uploads/1/3/0/7/130775776/sabixavozab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385417/normal_5ff5a9452d69f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495975/normal_60687acb5cf44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455642/normal_600a119fe7bac.pdfIn PDF document text
    • https://kigokevorusom.weebly.com/uploads/1/3/4/7/134709893/povudabiradip_vurozaj_firobevozege_vojiperaje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463266/normal_600cf76271442.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447431/normal_5fd2d89675994.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378607/normal_5fe4d7d5b284a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390092/normal_6006b6119816b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494417/normal_605fe99ad3d73.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0710af76-a00a-4cdf-8a75-0160db36aee1/jazumamovekefu.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/weminewotojinizuvezapev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f75592e3-7cc3-424a-8424-b86b7e24e357/tardiness_memo_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13acf530-7a57-4403-ab97-4576df6c4bd7/68839057580.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/rudelupiwogesusoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de84a299-205e-4c5b-8a83-d436aebb15be/at_the_mountains_of_madness_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/arya_telugu_movie_songs_naa.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/82253059594.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/33699286911.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/ejemplo_informe_descriptivo_preescolar.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
    • 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_off0000f1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A8 5112 bytes
SHA-256: 4a4b6012bfd91d8eb319a5d35afd81c11996e9aefa7be16f4d29f44ce70463f8
font_01_sfnt_off00010314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10314 13324 bytes
SHA-256: f6f9da5fe36692fcb20f12fae6b7eabc76318fc5bbb41f428c9f084904cdb04a
font_02_sfnt_off00012dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC9 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449