Malicious PDF — malware analysis report

Static analysis result for SHA-256 751b9079eeba0b05…

MALICIOUS

PDF

69.7 KB Created: 2021-02-15 11:02:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 3e6b76edb2bc8321822e250a68a18bc1 SHA-1: e69f26054b76c943059b9443ab7c7b90d5ce10d7 SHA-256: 751b9079eeba0b05aa72b35bcfa9f4910b3df1abdc4ddd1991c7ebfa69e08b95
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://crophysi.ru/wix?keyword=box+apk+mod In PDF document text
    • https://simepatu.weebly.com/uploads/1/3/4/2/134267103/11850ef04f8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492529/normal_601f80301d71d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464082/normal_5ff482ef5388f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369914/normal_601d727e9a540.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466143/normal_6001c83409c23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382429/normal_5fdb9f8e64f0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447460/normal_6003d5430dcee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450896/normal_601d70b31d8c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384649/normal_6025ff739737a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466367/normal_5fe893a48943e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482188/normal_5ff583003536d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guruwemuzotal.epizy.com/paxedadopib.pdfIn PDF document text
    • http://ramapenutizawa.epizy.com/grade_3_math_symmetry_worksheets.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_off0000d5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CA 4980 bytes
SHA-256: 99655065d9e2e679b544640a06e2d1fd674dc40ed01686cc702633705193d78d
font_01_sfnt_off0000e6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B5 10368 bytes
SHA-256: 437527c00d78b6199d027187a9df76a582dba65786ca99996c8451ee0f9879e0

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