Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0abafd2baaf36b6…

MALICIOUS

PDF

71.6 KB Created: 2021-01-26 22:52:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: d0397a9b57f03abed826eee10deaae7c SHA-1: e84630890dc046797054425a6470733aa63992c1 SHA-256: c0abafd2baaf36b620ae4d3f0651d53b994c4055278083c2f146cfd33916302d
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://crophysi.ru/wb?keyword=pbs%20unnatural%20causes%20when%20the%20bough%20breaks In PDF document text
    • https://static.s123-cdn-static.com/uploads/4377109/normal_5ff15d7804fe2.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/8jbhgji/cosmic_showdown_download.pdfIn PDF document text
    • http://wugafis.66ghz.com/fractions_worksheets_grade_4.pdfIn PDF document text
    • https://luzenage.weebly.com/uploads/1/3/4/3/134317967/ecf79fde1edc8fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503617/normal_5ffb10e72f155.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366660/normal_5ff6928925030.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/jidosatikim/52923928612.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/gamafajijamol.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/ashes_cricket_2009_highly_compressed_free.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/94190843918.pdfIn PDF document text
    • http://mevediruzorapaz.rf.gd/chamma_chamma_song_hdyaar._com.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/wajub.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/domain_of_logarithmic_function_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/43720326514.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/xapivejexizax.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_off0000db40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB40 5360 bytes
SHA-256: a67b6cfb1ba518f6b56ffa232eba61d9a8d23273ce3fe2419654aecd6c1f5bc6
font_01_sfnt_off0000ed84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED84 10608 bytes
SHA-256: 8003ff2045941eb10d3777ec953aede9893b5ddce44107859e82b5bd9d3e6c0e

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