Malicious PDF — malware analysis report

Static analysis result for SHA-256 3adac7e4feeb8d17…

MALICIOUS

PDF

68.1 KB Created: 2020-11-21 10:16:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 31c6ad522fe565e8816ea025c40db3f7 SHA-1: 922c57f7d5220e6def532a969e27fba0f8c619ea SHA-256: 3adac7e4feeb8d17c08f286780fb200ec83325a7444794e32913ba234d8f4e85
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://traffnew.ru/aws?utm_term=nursing+management+of+neonatal+jaundice+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451566/normal_5fb5dc6254fbb.pdfIn PDF document text
    • https://lijonalorobu.weebly.com/uploads/1/3/4/3/134340538/661f1149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413011/normal_5f955b0b31f36.pdfIn PDF document text
    • https://kujugozu.weebly.com/uploads/1/3/4/6/134660126/toratopoj_kelunaduxilip_fazivadagovufa_muliga.pdfIn PDF document text
    • https://veborejekeraleb.weebly.com/uploads/1/3/4/4/134480613/4a9c9ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/278133da-80f9-4ab8-9fb5-02d9d0535b46/23552263525.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/85677558405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03459b0c-b800-4b81-95ef-15ddf1865e5f/mixatevisefuwemidujapozi.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/defend_the_nuts_3.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/bizojuroxosulige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8335bac2-beb6-43b1-a046-f1332c1973a3/40915997161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daca98f5-91fe-470f-900d-2c3341ceeeba/understanding_by_design_lesson_plan.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_off0000cfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBF 5520 bytes
SHA-256: dd822262189dbe48dfe2b2dc0ce8c43e630bc57da78ecfc4e17e41a530f562b9
font_01_sfnt_off0000e27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27D 9584 bytes
SHA-256: 462aaa23cc2036d4665bea312d3aea32f19ab9837cd6fe5f381138fc2e0449ec