Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36aec7bd06177c0…

MALICIOUS

PDF

78.0 KB Created: 2021-01-01 06:05:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: d0dc5b23c5c331fb3c0a05e700f9377e SHA-1: 4036fcac3aa8e2bfad7e05fa3e85ea664a7f67fb SHA-256: f36aec7bd06177c009a12ba7c792e08c527059a21356b69dea19eb12bf382f76
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, including one pointing to 'trafficel.ru', suggesting a phishing or redirection scheme. The document body, though heavily obfuscated, contains references to 'The Sims Freeplay update' and 'wkhtmltopdf', likely serving as a lure to trick users into clicking the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/strik?utm_term=the+sims+freeplay+update PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367922/normal_5feb95f0cca45.pdfIn PDF document text
    • https://gitakitopawal.weebly.com/uploads/1/3/5/3/135325500/864a1a0ea3.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/muvunekagok/sefelaset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48f274ee-d649-42bc-88ab-e47df687b925/43666455034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/639f7419-f8bf-4a11-b2ad-b1763562f07d/wisoniri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c8bb043-dc13-4d5a-aa79-ca24a000b043/52958098426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/740e9e7f-3660-46f9-a43e-471e1c229ba0/juwivoropidurajamo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/567a9875-d18e-4419-b057-6bea4cbc6a39/sanoweniwuxakepijobaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/90739258997.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/91226040421.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/14441054069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eeb4fdc-c7f0-4de0-9d34-731c85830cea/terizuvoruwuvelejep.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_off0000f38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38F 5332 bytes
SHA-256: 8ae7cb8081580e4e95aa493da88cbfd1b82fcf8ad1503fdc6d000ebf7001a3c3
font_01_sfnt_off00010589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 11020 bytes
SHA-256: faf06d962d77fd6278a1aa90952c5deec0c126e1a13853c9a58534c83efe85bd

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