Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc693c8626b9acbf…

MALICIOUS

PDF

66.5 KB Created: 2021-02-14 09:50:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 9b26d5b1a47da05f255ba8955e8d97b3 SHA-1: b9d64460702a9a48598a41da93bc53cab444953c SHA-256: fc693c8626b9acbfe5b6753261eff54932ff77c3fd5ae7ea88c5782d89c06923
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links pointing to external PDF files, indicative of a link farm. One of the primary links redirects to a known malicious domain, suggesting an attempt to lead users to harmful content or further malware downloads. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

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://yafferge.ru/wb?keyword=android%20one%20ui%20home%20keeps%20stopping In PDF document text
    • https://womazineput.weebly.com/uploads/1/3/4/8/134895737/3c25e9b06ff90a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408348/normal_5fe9562339c48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426675/normal_5fddaba406ad3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501777/normal_5fe10b9038abb.pdfIn PDF document text
    • http://italy50wow.pro/the_crystal_bible_freeye9gx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385631/normal_5fe99b4590a86.pdfIn PDF document text
    • https://cdn.sqhk.co/samekikogeri/jevCVqW/31094171387.pdfIn PDF document text
    • http://walkover.me/87077695932oewz1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385412/normal_601f0749b33cb.pdfIn PDF document text
    • http://vezdesami.ru/rikalumuzec4cq4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527164/normal_5fc6bea36a125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471109/normal_601b8023e8f26.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_off0000c7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B6 5184 bytes
SHA-256: a04023930de43145651a2d2351e7bb21562d185679645766a482e7cfb6ecb57b
font_01_sfnt_off0000d932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD932 10488 bytes
SHA-256: 9924c94d6896387e95a60588b2cb894d32a262a259d5e95ca98abb482e7eeded

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