Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3c312ed3691d95…

MALICIOUS

PDF

69.5 KB Created: 2021-04-02 18:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5785efdb3fc7106b9c219cc910209fa3 SHA-1: c654e74305756d6ade3e174123bb2303852dcfa9 SHA-256: fd3c312ed3691d951cd2736a5c747dfa2c14d938ce9607774c234f6486e1469a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many of which point to SEO redirectors designed to phish users for information or deliver malware. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK indicate a large number of links intended to manipulate search engine results for malicious purposes. The primary malicious URLs identified are https://jacksth.ru/award?keyword=alice+in+wonderland+story+in+malayalam+pdf and http://tuzogat.sportsontheweb.net/99162437960.pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/award?keyword=alice+in+wonderland+story+in+malayalam+pdf PDF link annotation
    • http://tuzogat.sportsontheweb.net/99162437960.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422180/normal_6013786f9a69c.pdfIn PDF document text
    • http://feludekinopotas.scienceontheweb.net/jiwemojubaloxurubun.pdfIn PDF document text
    • https://cdn.sqhk.co/selusujava/ibaC7vn/combo_priest_guide_october_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/midrhgs/komonokararu.pdfIn PDF document text
    • https://cdn.sqhk.co/bopopujag/g0bHijD/31744991360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453115/normal_602df545ba90d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425005/normal_5ff62048e968c.pdfIn PDF document text
    • https://cdn.sqhk.co/xazewizol/ggjojg0/dutujigole.pdfIn PDF document text
    • http://gebigulexejo.sportsontheweb.net/kewaworetobizoroduta.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/xafaxotaful/suxawet.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/how_many_calories_in_a_sonic_burger_patty_grilled.pdfIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_f60d4a9e64de4f6e86585aa6cd954a57.pdf?index=trueIn PDF document text
    • https://3c8d80e7-2998-4b53-b1db-ea2053e4eee2.filesusr.com/ugd/5c8c55_d84ea32de0594c8c898a97e1a9320b3f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/44247783654.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/vuzibiletukise.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/dicionrio_espanhol_portugues_online_gratuito.pdfIn PDF document text
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_163e02716edc4eb7b4c44eb10f513378.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bofake/accounting_system_in_excel_format.pdfIn PDF document text
    • http://bavatesivo.myartsonline.com/diagnostic_microbiology_mahon_5th_edition_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/93576227893.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/sexotujutugise.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/wunote.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_off0000cf6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6F 5484 bytes
SHA-256: 552ff04dbbe2bb945f834c4242b6d5273ceba10ca9011b74eb0e3bd464f0281b
font_01_sfnt_off0000e218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE218 11360 bytes
SHA-256: 1852d104f9b249a2dfcc2829257760f4b67ffb170c479bbbc4d600dd31893037