Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d7f0ec71e8bfa0…

MALICIOUS

PDF

83.5 KB Created: 2021-02-18 06:18:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: e14765f8c5a091f9c5fb1e96d78f156a SHA-1: 183a58db81e399b1e91e7155cc27711a3c74f695 SHA-256: f1d7f0ec71e8bfa044924840888bf6fae348c5d4b918c9ecdb6b4ad28475b5b7
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a redirector link and a link farm. The embedded links, such as https://crophysi.ru/aws?utm_term=2006+chevrolet+corvette+0-60, suggest an attempt to direct users to potentially harmful external sites. The ML classifier and ClamAV detection further support its malicious nature, indicating it likely serves as a phishing or malware distribution vector.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=2006+chevrolet+corvette+0-60 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4390680/normal_6002af06a88c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407996/normal_5ff2fb2ddeec1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451229/normal_5ff8afd4e5288.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392649/normal_5fc9909d2c34e.pdfIn PDF document text
    • http://abanca-electronica.com/caracteristicas_principales_del_modo_de_produccion_socialismop2wfa.pdfIn PDF document text
    • https://wesuzekubiw.weebly.com/uploads/1/3/1/6/131607103/a0946d2b57342.pdfIn PDF document text
    • https://juwomazitebuden.weebly.com/uploads/1/3/1/4/131414743/dexazimuwurobiwoniv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502245/normal_5fe81ca7502bd.pdfIn PDF document text
    • https://tenogamux.weebly.com/uploads/1/3/2/6/132681545/jepaj.pdfIn PDF document text
    • http://wewedaz.iblogger.org/freeze_my_credit_report_transunion.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371536/normal_5fddcbaf96082.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421335/normal_5fe38179999a7.pdfIn PDF document text
    • http://mir23.xyz/30390641448rjjuc.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/ruzaganog/angular_material_design_template_free.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_off00010bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEF 4924 bytes
SHA-256: d15c86554b4ba3f91f66af4e83958744a7ca94adac882187aca393679dbd9946
font_01_sfnt_off00011cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC1 10700 bytes
SHA-256: 342114e5cfa480d404037999fef60991b94d6d516f22f91f6c54522397de9740

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