Malicious PDF — malware analysis report

Static analysis result for SHA-256 5544e3660ee531c4…

MALICIOUS

PDF

63.6 KB Created: 2020-11-11 06:22:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e2aa412064eb163efac1869e5bd556ae SHA-1: d9542ca010365949dfc919cc79f2b41b551a754c SHA-256: 5544e3660ee531c4119e8322dd16be8e183bdbbb9dee807bb8a8d6eeba6d4971
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffi.ru/aws?keyword=ncees+fe+reference+manual+pdf PDF link annotation
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/busixakowun_zefisuni.pdfIn PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/2d1905abc62e2a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373768/normal_5f8b6f955abba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411501/normal_5f9fffcb98fe5.pdfIn PDF document text
    • https://bisitewo.weebly.com/uploads/1/3/4/4/134496646/ketazifajatizudor.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/210221.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369334/normal_5fa8b01aca387.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/rakoximotelu.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/1000608.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/ef889388-21d3-4377-a2fa-4b4b80e896b1/zoxomeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9fcd571-b630-4cf4-a148-5ca32e401b9c/baxodoxosugidigeveto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed79ea23-1a68-4f53-be43-338c0c22233c/688856241.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b20ebf5f-7dac-4c61-9c82-a1d6f9c03ef2/junumasibujenowovevuxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c167ea99-1ce6-4837-8103-3c37a05f9e53/28816061665.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_off0000bc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2B 5268 bytes
SHA-256: a576448340ebfaef457cc58dd84f5352650b659f3f0cbcc5429ca5e5c7d9c173
font_01_sfnt_off0000ce05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE05 10360 bytes
SHA-256: d0f7fa819618a99e0e9eb6df7791aefce3d0814fa973534afbdb97ab36248ccd

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