Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a3a36fd2d806b9…

MALICIOUS

PDF

75.2 KB Created: 2021-02-28 01:52:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d92f6d41175fdfa3d6d4699b5dc80e3d SHA-1: c10c2885ece010ab3faf3fc3a8f1a8e01177e6e8 SHA-256: 26a3a36fd2d806b9e0dc7ea0b5410aae4b7c949594ee4265c3fe0d563778bfc3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded external links, identified as a PDF link farm. The primary URL, https://jottigo.ru/strik?utm_term=is+toshiba+a+smart+tv, suggests a potential phishing or scam lure. While no scripts were explicitly extracted, the PDF structure and the heuristic firings strongly indicate malicious intent, likely related to redirecting users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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=is+toshiba+a+smart+tv PDF link annotation
    • https://dezitatukuti.weebly.com/uploads/1/3/5/3/135389988/botadixixa.pdfIn PDF document text
    • https://zugavalomiseba.weebly.com/uploads/1/3/6/0/136082075/pudulove-vudun-sudugamano.pdfIn PDF document text
    • https://cdn.sqhk.co/xenumobavun/lhgcgcU/19895622511.pdfIn PDF document text
    • https://cdn.sqhk.co/kukusagufo/cjbjzaH/zuvipuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372383/normal_5fdf90e25bbef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367631/normal_6001b7cee66b4.pdfIn PDF document text
    • https://nojinogexosop.weebly.com/uploads/1/3/4/6/134695112/gumak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493881/normal_601262f9a9a8d.pdfIn PDF document text
    • https://romizipomubem.weebly.com/uploads/1/3/0/7/130775952/fujesataf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459326/normal_600bcc37bbbf1.pdfIn PDF document text
    • http://pazujiz.mygamesonline.org/224_valkyrie_best_powder.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454432/normal_6000d63b31521.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403140/normal_5fd18a6fcb278.pdfIn PDF document text
    • https://cdn.sqhk.co/mopomotop/eiejghf/halloween_party_games_for_work.pdfIn PDF document text
    • https://cdn.sqhk.co/perigupa/jiEhija/hello_kitty_cafe_new_york_city.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421966/normal_60054db38047e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468537/normal_6007213b39262.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000eaf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF0 5028 bytes
SHA-256: c6de4314daff31fe06e5e04bb08616ac1bfaeb6e6a7c8cd7c6ea0b3539a0fe52
font_01_sfnt_off0000fbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDF 10556 bytes
SHA-256: d91a036cfcc8b196e03d0dafb645f00882476fd0f4bdd24b75c294132205a8dd

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