Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf82c3fec355bad…

MALICIOUS

PDF

66.4 KB Created: 2021-02-25 13:23:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 0eb785b7ff71b5f8b9bf586d98b7c484 SHA-1: 2e027d2e77c7375df97ebe8ed29868e3c4756aec SHA-256: 4bf82c3fec355bad9da3520495fcf6ac8391c4f3a0c2567100d3b8b0cac5df41
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://druttle.ru/award?keyword=reasons+why+a+dryer+will+not+heat PDF link annotation
    • https://cdn.sqhk.co/kasavakujosi/d9hdjjz/freeroam_city_online_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/W1gj8CH/jemevenikinilob.pdfIn PDF document text
    • http://azorocheat6.xyz/the_official_sat_study_guide_2018_edrtxrv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381287/normal_6026ff469530a.pdfIn PDF document text
    • http://karnaval.host/70592332357r0od9.pdfIn PDF document text
    • https://jitivafume.weebly.com/uploads/1/3/0/9/130969372/4817658.pdfIn PDF document text
    • https://gakulenem.weebly.com/uploads/1/3/1/4/131437742/jumuz.pdfIn PDF document text
    • https://cdn.sqhk.co/zoturisa/hhihHp7/sukarasiwogakeropu.pdfIn PDF document text
    • https://xutepokukofegik.weebly.com/uploads/1/3/5/3/135391302/zakakirugelipevu.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/Wmhegeo/how_to_get_free_gems_in_pixel_petz.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/gotitibekovi/does_hardin_kill_himself_in_after_we_collided.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/nefelekudorutumi.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/mandatory_reporting_guide_nsw.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/consumer_reports_mattresses_canada.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_off0000cb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB78 5116 bytes
SHA-256: 14a9a6c0a702bc023af252f88076da066ab6c0fd8339886e0a6f378dd60dde55
font_01_sfnt_off0000dceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEB 9208 bytes
SHA-256: 6b85a12663248df0cabab80e1a3709bf4f076fce383cf6fe5205cd0e0dc053d9