Malicious PDF — malware analysis report

Static analysis result for SHA-256 d728a74535a1681f…

MALICIOUS

PDF

74.6 KB Created: 2021-03-01 07:32:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: b9f5ad553b8ffcd6ff6180ee597df3d7 SHA-1: 4a63a9bb92d2af0fc6c87e66e75d1ab25dab2b95 SHA-256: d728a74535a1681f1627711a7084a0fa28e1344397ffc8b9b59f092961f2e427
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=paper+mario+codes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380857/normal_602d39f9d9364.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446923/normal_5ff38c2731ebd.pdfIn PDF document text
    • http://life-news.tech/77584486526bkix8.pdfIn PDF document text
    • http://prechambre.xyz/dafasawevebojikademaxab4pah.pdfIn PDF document text
    • http://getfreecreditreport.info/what_happens_if_we_eat_too_much_junk_foodby2pa.pdfIn PDF document text
    • https://jolejijiwunepa.weebly.com/uploads/1/3/5/3/135334118/2851375.pdfIn PDF document text
    • https://rujivedudupuvi.weebly.com/uploads/1/3/6/0/136051492/9d860f09d06.pdfIn PDF document text
    • http://zebrait.fun/finding_perimeter_and_area_of_irregular_shapes_worksheetzwhy5.pdfIn PDF document text
    • http://uscarins.info/where_can_i_find_republic_of_teaz19dw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476007/normal_6018bbf52bbd9.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/widofafane/94759901682.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/uscf_chess_rating_lookup_old_format.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/brachial_plexus_mri_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/15600146415.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/import_android_chrome_bookmarks_to_firefox.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/68778933796.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/16214294832.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/eeo-_1_reporting_2018.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_off0000e9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 5188 bytes
SHA-256: 767cedf2a4d53c8cba8d17af2bd12f2f868628add0e54a09d1a846f92d75838f
font_01_sfnt_off0000fb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB52 10008 bytes
SHA-256: e0afe3fe4d752897b5ad498e4eb6039e9cd1e59b8fba037bb2afc1af3e561570