Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e12b5088c8919d…

MALICIOUS

PDF

72.7 KB Created: 2021-02-21 20:43:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 84a1742beff6de2b245e501dbaf7d4dc SHA-1: 0adeeea5be359cf4fd68500bf0c4589ddf02cbb2 SHA-256: b9e12b5088c8919d8f3907ad2bb13dfa5d433b443fdee29028ca290df4f4c091
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://yafferge.ru/aws?utm_term=how+to+find+my+ssi+score In PDF document text
    • https://cdn-cms.f-static.net/uploads/4477386/normal_6026d344be865.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495399/normal_6018b7b949948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417321/normal_5fd2848d3b47c.pdfIn PDF document text
    • http://wawovotem.22web.org/cattle_guard_forms_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/DicZdPX/gimurodagezomuxirowib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390081/normal_600b6261a713b.pdfIn PDF document text
    • https://wezenojaze.weebly.com/uploads/1/3/4/0/134095843/dedasonalimajakof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zobawukesilebaf.epizy.com/sanyo_air_conditioner_remote_control_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/wiwibufolisevo.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/kuvuvipuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/dovoduvav.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/19800266754.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/bubbleupnp_apk_paid.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/xefuwijofagizovo.pdfIn PDF document text
    • http://zunizififuve.epizy.com/95973044621.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_off0000e0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B1 5080 bytes
SHA-256: 6a2447236b26f8191c24ebbe3a7cc420e36fb60eea48d5a485fdeef887aa8f52
font_01_sfnt_off0000f202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF202 10640 bytes
SHA-256: 8a32bdb82600fd15ef38c73d80fbebd51375aed85c2fa0d9a2b1c83083e19e74

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