Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f81babf82d0ef89…

MALICIOUS

PDF

73.8 KB Created: 2021-02-20 23:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 98422408b6b853cc894aa4ce27249168 SHA-1: 1434a5c0c83efb68e0acbc82fc4447b0e87ee220 SHA-256: 4f81babf82d0ef89ddef572ae152148a5a1f52a4b559de7699bc85844fdaef86
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, yafferge.ru, which is likely used to deliver a payload. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing and trojan activity. The embedded URL and the document's content suggest a lure to download software, aligning with a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://yafferge.ru/wix?keyword=download+old+google+picasa In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380869/normal_602a2223f0aa1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368221/normal_5fef3a6dca880.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387230/normal_601df55a45b9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486041/normal_6001607492549.pdfIn PDF document text
    • http://fringigejy.site/54063064856zl70a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475854/normal_602ebb730684c.pdfIn PDF document text
    • http://najezeb.22web.org/48993645149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500665/normal_601ec91759d44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473926/normal_5fec75367e564.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460042/normal_5ff61d4bb40a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408176/normal_5fe90f3043623.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/geradi/35599657068.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/android_apple_watch_hack.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/football_manager_2017_mac_os_x.pdfIn PDF document text
    • http://bidavotajowev.epizy.com/29815597482.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/put_contemplate_into_a_sentence.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_off0000e4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DE 5236 bytes
SHA-256: 3252410058e3f1517d4f6add8134e057a742e55eac2c6e89a5e88a5114179230
font_01_sfnt_off0000f6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DF 10240 bytes
SHA-256: 19393bce4d862345c184e455a45b7ef1ce4d5df6ef922086622476cf359014b3

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