Malicious PDF — malware analysis report

Static analysis result for SHA-256 de91b3fa988b0ef2…

MALICIOUS

PDF

65.6 KB Created: 2021-02-24 11:17:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 3aa064ae5c284e78cdb9cc3c2a3c133c SHA-1: 4ea2501ce0ffcd2d2ccdd9299cc03e8c8519c4eb SHA-256: de91b3fa988b0ef2f33374e0a0694f51c55cf0fcc3f0f3c7836384ddb7c010d5
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The heuristic firings indicate the document is designed to lead users to harmful infrastructure, likely for phishing or malware distribution. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence score strongly suggest a malicious intent.

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 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.
  • 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/wb?keyword=nikon%20p-tactical%20.223%203x32%20matte%20bdc%20carbine In PDF document text
    • https://static.s123-cdn-static.com/uploads/4501794/normal_5ff918f2f2baf.pdfIn PDF document text
    • http://wagikopegufiza.66ghz.com/bhagavad_gita_chapter_8_in_sanskrit.pdfIn PDF document text
    • http://timecodes.net/34674538229mdxbl.pdfIn PDF document text
    • https://furedanoduribi.weebly.com/uploads/1/3/4/6/134681858/mazukodejatumu-levanoj-puxejamiwazudet-pebobegokawu.pdfIn PDF document text
    • http://aydym.club/89197746686bukkk.pdfIn PDF document text
    • https://fowuwulavo.weebly.com/uploads/1/3/4/7/134754099/21003ededd.pdfIn PDF document text
    • https://mexekujiwununiv.weebly.com/uploads/1/3/1/4/131407761/negosobex.pdfIn PDF document text
    • https://lufisadoxusixa.weebly.com/uploads/1/3/4/5/134583632/dumugezavarevi.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/hipvhdG/debusupisagalume.pdfIn PDF document text
    • http://selectgetc.top/pojujunux94vr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5fd0df4b5dc6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_60333edf09ce7.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_off0000c1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E0 5644 bytes
SHA-256: 07ffc96c6c5c865bfdf14cdd29f6f39b4b1516970ce020c539c07eac119a9193
font_01_sfnt_off0000d50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50B 10776 bytes
SHA-256: d9ccd59711cc791921859886074abc041699551fc4d67535299c8313d0ef2c6e

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