Malicious PDF — malware analysis report

Static analysis result for SHA-256 914a68e95d866795…

MALICIOUS

PDF

69.7 KB Created: 2021-02-15 17:39:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 212c40f9e0134be047b1c88f3efd7015 SHA-1: 70f8fb95f8eda852826918227286a4b4498187bf SHA-256: 914a68e95d8667950653cdabaa490a161a191f7295cea5f735aafee0ce7abc06
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, with one prominent example being 'https://jufasoxoko.weebly.com/uploads/1/3/5/3/135315704/gipiboberuxu-zefotenik-xofimo-kiten.pdf'. The presence of embedded URLs and the ML classifier's high confidence score further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to drive traffic to potentially harmful content.

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://baarspo.ru/wix?keyword=tony+and+mykelti+wedding PDF link annotation
    • https://jufasoxoko.weebly.com/uploads/1/3/5/3/135315704/gipiboberuxu-zefotenik-xofimo-kiten.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465709/normal_5fcc541020f10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415768/normal_5ff49b8e8c0c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413126/normal_5fecd14c61f9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365598/normal_6004d8df4fcb5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487197/normal_5fed71678c1c4.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/jgghcA2/84880092627.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449992/normal_5fe3c0272f5c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417040/normal_6004e57e40f83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388598/normal_5fe3b04207eb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393641/normal_5fd6523c922ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499653/normal_601bd6ed59363.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/Cjj0Qic/9175457237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374704/normal_60160be2d3e17.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/egehj4J/67224067571.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD645 5080 bytes
SHA-256: a53d3678e4022718057565665d64794394d7354daed64f2f492a15863b1a0939
font_01_sfnt_off0000e79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79E 10044 bytes
SHA-256: 1507ca9427ddc30a0fc8ae00f40f8987aab43688ad91e76e0d9e373a6396b6d5

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