Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f753a8548294732…

MALICIOUS

PDF

69.0 KB Created: 2020-12-08 04:46:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 805311e30090f63e18e6bad80a5598ab SHA-1: bb0f0ab3e9dfd0b952b9f2b8d87a6ff042720e54 SHA-256: 6f753a8548294732036dd4b4e87370d1aecbd6251f8cf49d1df7d1e88d85b9b5
164 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 number of external links, with one identified as a potential phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. The presence of embedded URLs and the heuristic for a link farm suggest the document is designed to redirect users to malicious content.

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=ucinet+for+mac PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479445/normal_5fc96cba8cc9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501503/normal_5fc767df76edc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411921/normal_5f947969ab062.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/7702792.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/22b91a82-9a26-4144-87c2-2d9d78ca293a/26942908138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f826168-84d7-42ea-8fb6-195de0c175e4/bixosuxipepijakani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cf1dbfc-8a70-4f90-8e3c-cceef0a6ee6a/ruxojudugimuralu.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/best_android_camera_phone_2019_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc3d3b72-e475-4c94-b25b-f42063a40822/gugeximi.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/38137041754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/846320cd-ea00-431b-9950-2894df4d66ee/vilovevugekumo.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_off0000cfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC6 4808 bytes
SHA-256: e098e6e20a13c2c3576fe742edfa799dac3eafbccb8448aaae305b088990c21d
font_01_sfnt_off0000e00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00B 11772 bytes
SHA-256: 9908e9a41d595cd4d7b7c795b1ab39a380e8d97802fa94f68306922fb709d311

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