Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b903998a8f5f3c8…

MALICIOUS

PDF

62.2 KB Created: 2020-11-20 08:00:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: c661b4ba91d5a8e713f89bcd7ab459d0 SHA-1: 476c0bc66caa3743775818d6fd7ff4ea946e2c32 SHA-256: 9b903998a8f5f3c8e0388d59837ae673a4dfdb5629ab4830d4ee5de5831c4c62
262 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=superlative+worksheets+with+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374859/normal_5f91967f9e3e9.pdfIn PDF document text
    • https://mizunilido.weebly.com/uploads/1/3/4/3/134352057/9036827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369502/normal_5fb613e5c1c4e.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/widetunipet/52027766590.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1213d685-e600-40c5-808d-7d80fdd249c8/rafom.pdfIn PDF document text
    • https://s3.amazonaws.com/digigitusuduk/idsa_2016_guidelines_hap_vap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4f155ae-b0f2-439a-833f-948a603310eb/desabunomukubilasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ba8b1ae-70ac-40b0-a6bc-c1b5462d1c53/napage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50b8a86e-9f19-46b8-a3ba-b18515a1fff9/fury_by_laurann_dohner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce1df31c-6265-4d1c-be93-f235ef17a4bd/14283438575.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e79cfeaa-78e0-435e-833b-f58f67f7c4c3/61432846112.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/451de951-5973-4958-84e8-7855f86e06df/solitaire_chess_online.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/xosaxopoz.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_off0000b60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60E 5224 bytes
SHA-256: 5eba6f8e7d200debb7b53bf04c3131045bfb98408fa39ae555d99d64a213b8e5
font_01_sfnt_off0000c7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E0 11044 bytes
SHA-256: 0cc1389a722703a85f01f8a6f33fc3087034c313f325d708389aaef209863fb5

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