Malicious PDF — malware analysis report

Static analysis result for SHA-256 023f9e12de6c4a05…

MALICIOUS

PDF

77.0 KB Created: 2021-04-28 00:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 107c1a8b4ee10d6a4eba7b1ad7e43c4c SHA-1: 6f994935fab51ec2c982c29b7715d41c22c3b082 SHA-256: 023f9e12de6c4a05fa025c40650d8d00545ec7e7b7f3596dc49bfc66b4a4ecf2
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The primary malicious URL identified is https://botokaw.ru/strik?utm_term=how+to+name+your+romance+novel, which is likely used to direct users to a phishing or malware download page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://botokaw.ru/strik?utm_term=how+to+name+your+romance+novel PDF link annotation
    • http://peroruse.iblogger.org/eyeshadow_guide_stickers.pdfIn PDF document text
    • https://jijaxiwiruba.weebly.com/uploads/1/3/5/3/135333012/fomupukuposudebiv.pdfIn PDF document text
    • https://bijufipenonovo.weebly.com/uploads/1/3/4/5/134529550/b67fff7d978.pdfIn PDF document text
    • https://kekofazejigax.weebly.com/uploads/1/3/4/6/134600595/mojug_tuwiwemober.pdfIn PDF document text
    • https://wusuritod.weebly.com/uploads/1/3/0/7/130739885/95b477e.pdfIn PDF document text
    • https://zuwexonoporij.weebly.com/uploads/1/3/5/3/135317719/rugowakefe-sufiwuribupuni.pdfIn PDF document text
    • https://tizevilujiv.weebly.com/uploads/1/3/1/4/131406709/7678495.pdfIn PDF document text
    • http://rakufudufe.iblogger.org/vitanupefuvilavazutip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_4828852b132c41dda2b6bb1739ba63ea.pdf?index=trueIn PDF document text
    • https://c2963e02-5f2a-49ff-bb4d-22715b80ab3a.filesusr.com/ugd/55efe4_af6c2c8c73f34ed0a717dd1904e8d6c6.pdf?index=trueIn PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_ed8e6524d8f246c38e20ae058d50f6c7.pdf?index=trueIn PDF document text
    • http://xenelerowem.rf.gd/cahier_de_journal_3_ap.pdfIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_d6332bc20c224f8898cc9e19c971a777.pdf?index=trueIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_3ba00facc20247409d09fdd1a7c71880.pdf?index=trueIn PDF document text
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_ea25d83afa5e48c3910470518a33211f.pdf?index=trueIn PDF document text
    • http://tenurusimuxu.epizy.com/masuvubujupomovugeneba.pdfIn PDF document text
    • https://76c87692-cca9-4651-be8e-de6412dad411.filesusr.com/ugd/fdad67_8e7f528484214135805effb9acd2a6e1.pdf?index=trueIn PDF document text
    • https://1f9cfe0c-d655-4514-b58a-75380282e405.filesusr.com/ugd/d31784_472d90529bd7440ab6f8a40ec25a787a.pdf?index=trueIn PDF document text
    • https://bee08bb6-d8c1-4cc5-89f0-d6ac88a4f64a.filesusr.com/ugd/8b8a1f_3834151b29d844a4b0070cd7fca36e1e.pdf?index=trueIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_251a5311ce4947918ba6316e563dbe59.pdf?index=trueIn 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_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 4984 bytes
SHA-256: fc9ddcd46b502307c4c20374bb56ed66fb609a209a3351071b073b18f1371183
font_01_sfnt_off00010063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10063 11004 bytes
SHA-256: a5b403d46472ff70de6ce0225ebc7f15bd399b7a475ca2bf8dfd58fd90b53028