Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b49742c3b93d44d…

MALICIOUS

PDF

79.4 KB Created: 2020-11-10 18:48:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c98b3d41cc359bb3d307c2ca96fdeb24 SHA-1: 9bf9ebe2c513e59be9ec65752f945f9535cd6010 SHA-256: 5b49742c3b93d44de44e4bf1b1bbb43ea6679042c7ca4e0248c0f449ad508471
156 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 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
  • 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.
  • 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://trafftec.ru/aws?keyword=watch+chinese+movies+online+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379374/normal_5f8e0b7048cb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5f88f77ddf59a.pdfIn PDF document text
    • https://pezosoxebigaxox.weebly.com/uploads/1/3/4/3/134337327/c1865837.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_5f9baa3614c12.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/zidenigad/41364170740.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/pupare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f55f91df-84cc-4eab-8c60-649fd350f468/oxenfree_ren_drowning.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/dunder_mifflin_building_real.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/81705328147.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/motuna.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/26342499390.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_off0000f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 5536 bytes
SHA-256: 74428b48a520d7a6cbc179543e52e3255f3708797f96f8275c90b5f8c8799dab
font_01_sfnt_off00010cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC0 10688 bytes
SHA-256: ecc605f3290eb22ed825d66e507ae25a476426c0704e57dda78ef62c3e2515e7

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