Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa97fc66a30a63d3…

MALICIOUS

PDF

67.0 KB Created: 2021-02-07 22:56:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 5ffe70d0d4f555b9bb5d5742dd384dc7 SHA-1: 66688611836910ee596412f7f5c3cae0f9e2f572 SHA-256: aa97fc66a30a63d3c8b8f2663ab9585713721d2092164f3a27e217c9ff2c61ba
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://bologen.ru/wb?keyword=acceptance%20of%20resignation%20letter%20template%20australia PDF link annotation
    • https://nelemiken.weebly.com/uploads/1/3/4/7/134704654/nalijilone_xukadom_lulifupida.pdfIn PDF document text
    • https://detubutil.weebly.com/uploads/1/3/5/3/135348338/movelugudevuxawete.pdfIn PDF document text
    • https://vibusipapomokij.weebly.com/uploads/1/3/2/6/132682711/garadeg.pdfIn PDF document text
    • https://zejosawazir.weebly.com/uploads/1/3/1/8/131856185/3753946.pdfIn PDF document text
    • https://dakewamegiru.weebly.com/uploads/1/3/5/3/135305658/refar.pdfIn PDF document text
    • https://mevemedetu.weebly.com/uploads/1/3/1/8/131871578/537986c2c29.pdfIn PDF document text
    • https://mugebixivezir.weebly.com/uploads/1/3/1/4/131484268/2176251.pdfIn PDF document text
    • https://fefedajukuda.weebly.com/uploads/1/3/1/0/131070841/7235861.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/ligole/top_android_box_apps_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/dazapemidebulogozonireb.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/naduwirojaludakepodu.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/42832161725.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/credit_memo_template_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/suluvinegutol.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/wipare.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_off0000ca54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA54 5324 bytes
SHA-256: fa335fbbfad5034d9e7c667d45dca99a216325d010a887f8df0daf0c27b65d41
font_01_sfnt_off0000dc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 9656 bytes
SHA-256: 1b556b47620d131e3259c30d3beed62b576e7fa3a0ba03ad34fc33ac6be53de6