Malicious PDF — malware analysis report

Static analysis result for SHA-256 a660a45aa8c4d381…

MALICIOUS

PDF

71.9 KB Created: 2021-02-25 15:05:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: ea7556cde1d64e38b0d57e5d45450dcc SHA-1: f2dbf54f86297d28a8f472f346301baabed2b11a SHA-256: a660a45aa8c4d3814daba1fd6f25afb0938db4ed7a34eb29889333fde929a0e6
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/award?keyword=used+mini+cooper+dealer+near+me In PDF document text
    • https://static.s123-cdn-static.com/uploads/4491169/normal_60045a9a4c38b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488560/normal_603197cd5e83c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392195/normal_5fe705f23cd1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382779/normal_5fcbe593554ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377938/normal_5fe764cf3f7bd.pdfIn PDF document text
    • http://norusezuluwo.iblogger.org/conflict_resolution_definition_and_examples.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445879/normal_6003ccb852b9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383300/normal_600d35c7d11b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477139/normal_6007d89d1f065.pdfIn PDF document text
    • https://pugotaba.weebly.com/uploads/1/3/5/3/135302821/6082906.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367674/normal_6008f18a6efe6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/how_to_make_vinyl_decals_with_cricut_expression.pdfIn PDF document text
    • http://desakoda.rf.gd/wuwowuwibakubixu.pdfIn PDF document text
    • http://nugafafekovad.epizy.com/aptoide_apk_on_ios.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/what_is_a_group_theory.pdfIn PDF document text
    • http://pupudewasoxo.epizy.com/kixodofuwuvopirasovoza.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_off0000ddc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC5 5212 bytes
SHA-256: 3339a45048d0be94b4dc5682f3faf8a5bffdc9d6631bb5c57a3cb30bffa0ed45
font_01_sfnt_off0000ef65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF65 10412 bytes
SHA-256: 9d4864d73c8aa7c0007bc4d725d66a01134c55575caa6b35fa23a3d2ce4c53cd

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