Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b3cf1c4a088e4aa…

MALICIOUS

PDF

71.8 KB Created: 2021-01-17 08:39:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: e27d0392da4da3a1c426909c6f55d028 SHA-1: c4c4df51bdf373194c8484ec83ee9ce0c5fcf6c2 SHA-256: 9b3cf1c4a088e4aa9e38160ee79f6dfa32eff6a45cfbe69cf88e326fc2fef979
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/wb?keyword=outbreak%20definition%20covid%20ontario In PDF document text
    • https://site-1177041.mozfiles.com/files/1177041/v4_mustang_2018.pdfIn PDF document text
    • https://site-1168130.mozfiles.com/files/1168130/halloween_movies_in_order_explained.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451019/normal_5fcdef43847cf.pdfIn PDF document text
    • https://site-1171882.mozfiles.com/files/1171882/bofipadajojikupejot.pdfIn PDF document text
    • https://benukakaruw.weebly.com/uploads/1/3/4/7/134745121/gisoserilef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393345/normal_5f949b1c77186.pdfIn PDF document text
    • https://site-1172079.mozfiles.com/files/1172079/gunemepigope.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476757/normal_5ff1cac16d552.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451231/normal_5fd298d017d85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381344/normal_5ff525cd445fb.pdfIn PDF document text
    • https://vumukawa.weebly.com/uploads/1/3/4/6/134662430/riwatevivozajes_zetovo_bomoz_zelix.pdfIn PDF document text
    • https://site-1178814.mozfiles.com/files/1178814/guvosatuzikewoxife.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376127/normal_5fc6c9043195d.pdfIn PDF document text
    • https://site-1249328.mozfiles.com/files/1249328/desh_bhakti_song_2019.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/xipavir/62022936897.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_off0000dcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB8 5096 bytes
SHA-256: cd299d5a15e91a72ac57ecb9466130ebe26615d18bd44de14a77c15f0380130e
font_01_sfnt_off0000ee21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE21 10192 bytes
SHA-256: 768b1ebd0a69bd58a43cc07c10e00270e3c041a350425b829c3d522e748e71ff

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