Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e35198fa393c219…

MALICIOUS

PDF

67.0 KB Created: 2020-11-13 20:01:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 75a03458e169997eb2dd0cf5cb9a3530 SHA-1: 76768a279a5572fd14e4625b8a47aa021929b8ec SHA-256: 5e35198fa393c21974075fe8c02ad76562733d1d265fcca2d8e77f5112ecff36
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a high-severity heuristic indicating it's an SEO redirector for a free-download phishing lure. The embedded URL, https://traffset.ru/123?utm_term=icnd1+study+guide+reddit, is the primary indicator of this malicious redirection. While no scripts were explicitly extracted, the PDF structure and the nature of the redirector suggest an attempt to trick the user into downloading a secondary payload or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/123?utm_term=icnd1+study+guide+reddit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f9f96f6a4622.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5f8a3e04f24bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401555/normal_5f942c61e5393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449012/normal_5fac4ecb6ba07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420237/normal_5fa235e3d424a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380382/normal_5f96460141d33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461211/normal_5fa1f874b7a26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417414/normal_5f97b7eca4629.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421461/normal_5fab5efeeb6d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/575d8563-0384-4468-a955-29424807d041/hobo_prison_break_passwords.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/72855661565.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_off0000c9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B0 4956 bytes
SHA-256: 57e077f8800dbe9dbb4bf00f0c91ffad24b37a136e62b8dcf1a60502cadada93
font_01_sfnt_off0000daab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAB 10824 bytes
SHA-256: 2b0c724b61d135182bb90c63f82f2ceae480c8e3d73dc451f7d02a77f842404e

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