Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89f665525211390…

MALICIOUS

PDF

71.3 KB Created: 2020-12-30 13:13:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: 77dfd7f4c6f5094b74ec0053671b8728 SHA-1: a517f20b40be2631788a5f801fe5ab55146a13ad SHA-256: b89f665525211390129d99319a5ef97b98ddabb16767908eb574325e99c0ab2f
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/wb?keyword=among%20us%20pc%20game%20age%20rating In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368495/normal_5f883d5d46ffc.pdfIn PDF document text
    • https://jiketajaw.weebly.com/uploads/1/3/4/4/134464131/5703e92a9159.pdfIn PDF document text
    • https://nevofegef.weebly.com/uploads/1/3/4/8/134851200/jixibotilanugunaru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416796/normal_5f97ccd0e3722.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368951/normal_5f8a83c4444a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e3609b0-232f-4509-b1ba-207e8b163baa/pure_enrichment_humidifier_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/29898456271.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f26db75-b327-4f8b-9c88-2cbf85a6bb33/2008_yamaha_v_star_1100_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e94abf0-4b78-4b07-bd5f-1f9a4969812e/cara_mendidik_anak.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/18782437113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da45c962-bd58-4dea-9008-d6215f5382ee/66783206412.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eedb794d-664f-4a16-a936-501811546b17/30956871601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bce1c6f2-816f-4408-b5dc-ea08b760e14e/rialto_high_school_shooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d119211-8de3-42d8-a00c-08b5c56ad355/vobojosakinafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35044c1e-fe34-4cf7-bc7f-0092aa035beb/nevijikazubidotavalelaru.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_off0000db80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB80 5208 bytes
SHA-256: 6171713b5d4e62f6649b7709234a19a00e6bd8795ba53cadf9f6add82b041dc8
font_01_sfnt_off0000ed26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED26 10360 bytes
SHA-256: d1681dc1875467ebd6b58c666f120e7d42d796194f63001b9c3f5f91978ceec0

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