Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54a7382de44f5c4…

MALICIOUS

PDF

75.4 KB Created: 2021-02-14 13:09:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 0073186bf1e78f3f5919a642ad527aa2 SHA-1: b3f64751f6d670ecc52c54f404db5b64f3f4274c SHA-256: b54a7382de44f5c47d51ab697a0c5cbf2a48544f2afa84cf758fbb19104459fc
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://bologen.ru/aws?utm_term=fannie+mae+guidelines+on+delinquent+student+loans PDF link annotation
    • https://cdn.sqhk.co/bifoligi/cgcgeii/ralejenikagetix.pdfIn PDF document text
    • https://cdn.sqhk.co/vomisape/hgwdigL/20610896532.pdfIn PDF document text
    • https://cdn.sqhk.co/letojeka/gjc5Yih/nutukumipozovudigi.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/iiif9ii/843847120.pdfIn PDF document text
    • https://tejaxoxujita.weebly.com/uploads/1/3/4/3/134368030/nezebifigujo.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/jhhcCij/29282980876.pdfIn PDF document text
    • https://cdn.sqhk.co/woteruzid/hTidghw/wuwoja.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/hfYxNnN/stick_shadow_fighter_mod_apk_1._1._8.pdfIn PDF document text
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/4458275.pdfIn PDF document text
    • https://cdn.sqhk.co/fekebazi/aaGggFf/idle_medieval_village_3d_tycoon_games.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/damerirazib/detejakubimufitonufakem.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/28833034095.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/tazariwixiruzufe.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/inception_report_template.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/chhattisgarh_map_blank.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_off0000eab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB8 5128 bytes
SHA-256: cd74be1ca9d00704b7b458c0c4e909ef316e3e54a8813cd4e30654a2c82bb1a7
font_01_sfnt_off0000fc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC14 10648 bytes
SHA-256: e083b623f5897e57ebb487584c3cf6c3266c0eeb428d343f2e1e93901c1e3d3b