Malicious PDF — malware analysis report

Static analysis result for SHA-256 288936af45131cdf…

MALICIOUS

PDF

72.3 KB Created: 2021-02-21 07:28:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 8234f5f50cd06856f35b5c02e5992dbe SHA-1: db410d0e25e8d7960717910a00c0778ae8f8a520 SHA-256: 288936af45131cdf3a37809b10217b171fc6b54a78fd9cef9c70488fa5f0831b
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://leonvi.ru/123?utm_term=audio+technica+at-lp60x+usb+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369909/normal_60210c8a021fa.pdfIn PDF document text
    • http://habercigo.com/lakegorolubozesafagagijkx58q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489992/normal_5fe32f376fa21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467003/normal_602b64209a60f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391624/normal_5fe51087af0dd.pdfIn PDF document text
    • https://girezerel.weebly.com/uploads/1/3/1/0/131070389/9422522.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/dabatisew/98904143043.pdfIn PDF document text
    • http://gotelunokokipu.rf.gd/92246848041.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/citizenship_application_form_n-_400_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/b_ed_books_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/zokabazabad.pdfIn PDF document text
    • http://wolixebob.rf.gd/52152874380.pdfIn PDF document text
    • https://s3.amazonaws.com/lazesej/xesorowixawapuzoz.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/lojomerubazesomezira.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/royal_life_saving_first_aid_workbook_answers.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_off0000d89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89B 5836 bytes
SHA-256: 6815cb286e3416ac0fd6b7e6dacbccb0b85fd44ceccd4476f68be74024c1b0c7
font_01_sfnt_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 13736 bytes
SHA-256: 3445411750c2a693688e4d2d6a2bf95354b03d2b5c440907ed2ca22c40d5edae