Malicious PDF — malware analysis report

Static analysis result for SHA-256 9256c37bc5a5dcf2…

MALICIOUS

PDF

72.3 KB Created: 2021-01-21 17:10:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 996602f134a5c52433f6cf7246146631 SHA-1: 7a1ba45f36d6e7e3d28430b9f8bb5368e33c97b7 SHA-256: 9256c37bc5a5dcf22d11a581fa67621ec3935200759b562868291a69c988a7be
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized content, suggesting a link farm or phishing lure. The presence of a URL with UTM parameters and a high ML classifier score further indicates malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

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://trafftec.ru/aws?utm_term=acrylic+plastic+sheets+philippines PDF link annotation
    • http://judijemavup.22web.org/zolidagunizewizew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445532/normal_5fca40e77339f.pdfIn PDF document text
    • https://site-1172862.mozfiles.com/files/1172862/kenosiperevid.pdfIn PDF document text
    • https://site-1172743.mozfiles.com/files/1172743/aus_sl_pitch_report.pdfIn PDF document text
    • https://site-1177548.mozfiles.com/files/1177548/52294155485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446174/normal_5fa4be5beb5fb.pdfIn PDF document text
    • https://kakituku.weebly.com/uploads/1/3/4/5/134589995/runafofa.pdfIn PDF document text
    • https://site-1166064.mozfiles.com/files/1166064/gradeup_app_apk_latest_version.pdfIn PDF document text
    • https://risonozolediwar.weebly.com/uploads/1/3/1/3/131398017/kodufe.pdfIn PDF document text
    • http://dexowowijovovu.iblogger.org/xijazokowugate.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/8gpPrOq/pottery_barn_woodland_stocking_collection.pdfIn PDF document text
    • https://site-1179882.mozfiles.com/files/1179882/barloworld_shares_khula_sizwe_application_form.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/resixexi/international_migration_report_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/12538091752.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/11767050534.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/10404310604.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1C 5112 bytes
SHA-256: e3f81cd20384f9b8e62d049d41095857100719bf11531e0e516d982e76f0fc10
font_01_sfnt_off0000f082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 10512 bytes
SHA-256: 85d0fe208b0d19d6758bcf270c5426d5dad40866b13a505c658b2f0d3edb6e96

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