Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c41c5f5c7492e92…

MALICIOUS

PDF

64.3 KB Created: 2021-01-30 14:40:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: 8b97dec9c6235d97d003dd121cdeb974 SHA-1: 88e8a5d91c3746392a467b1fec6a71bbce06c87a SHA-256: 4c41c5f5c7492e92768eb11d0d6c4a0bbfc77e65d2c8f96f875ad1bde277689e
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=ucla+campus+map+pdf PDF link annotation
    • https://wirupexulabajes.weebly.com/uploads/1/3/5/3/135322132/gepitejatudopoxulipu.pdfIn PDF document text
    • http://saudiautoinsurance.com/58319900282friv0.pdfIn PDF document text
    • http://lovelid.xyz/john_denver_songbookf2i57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403806/normal_5fe40f60c59bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484632/normal_5ff2c310116a4.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/dqiehhv/diy_christmas_costume_ideas_for_adults.pdfIn PDF document text
    • http://speak4pro.com/924156001882a65z.pdfIn PDF document text
    • https://tepugajir.weebly.com/uploads/1/3/0/8/130874129/jefikevavepevoxoku.pdfIn PDF document text
    • http://thedefenseforge.com/govepegozidifosofovelaxev6ajjv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490129/normal_60109b73cb5a8.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/gezejoputiwinu/telerik_reporting_documentation.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/hiv_aids_positive_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/31710888706.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/28020651374.pdfIn PDF document text
    • http://sonunetenigido.epizy.com/laxejugavofalezegeno.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_off0000bf5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5B 5196 bytes
SHA-256: ecf88e0cd0b06151f0c8eb7818d7cd69b67d9f1a19e73d412ff23157df5073e3
font_01_sfnt_off0000d0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FF 10412 bytes
SHA-256: 379020cd8871dd534cd400d1312b4ec8963665386e3a04781ffabb0d1de72bc3