Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d7da8c3bd951b4…

MALICIOUS

PDF

75.7 KB Created: 2021-03-04 01:15:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: fb5f0479f05200c79ad331c85563fd4a SHA-1: 3b303a81be68fd0de26c1fadca75b2cf15543aac SHA-256: c4d7da8c3bd951b4c4a9b44afd2e90d0979006edb21e6f3a13fc2560483b8707
262 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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://crophysi.ru/wix?keyword=download+focus+movie+by+will+smith In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379837/normal_600f2d1be509e.pdfIn PDF document text
    • http://ita-yog.space/java_programming_language_free_online_coursedqjfy.pdfIn PDF document text
    • http://nosixavol.sportsontheweb.net/24364074588.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453888/normal_600789c35de43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490934/normal_6022e98c9bcbb.pdfIn PDF document text
    • http://pedron.fun/experiment_to_prove_newtons_third_law_of_motionifupt.pdfIn PDF document text
    • http://taher-tcac.com/how_to_convert_britax_frontier_clicktight_to_boosterny8j8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501208/normal_5ff166c548150.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462727/normal_5fcbf99260c26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462066/normal_5ff88ee2b7c28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479904/normal_601a6d2f624ff.pdfIn PDF document text
    • https://gusoberususot.weebly.com/uploads/1/3/1/4/131454899/geragisekana_dewipuzupimise_xasato_xepotonetapeta.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456671/normal_5fe1b14612810.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500432/normal_603a03d159b10.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/jebupofedijakuk/lomapesezufomoguduz.pdfIn PDF document text
    • http://moxixezegosa.onlinewebshop.net/16427241076.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/67025951312.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/kathi_tamil_movie_isaimini.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_off0000eb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5F 5560 bytes
SHA-256: b1eb6afed36b2c5770e25e72edd0f2434ce5c8eab1f16aa97cf2a0d82b8fa5b6
font_01_sfnt_off0000fe4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4D 10392 bytes
SHA-256: 9bcbffa4fd7e080d984f37bd940587c9f4475395499f86879bc8b79de284bd7b