Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd5e84f443389c4…

MALICIOUS

PDF

115.6 KB Created: 2021-05-31 14:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce695a11193a7b9a7c1fcb4c6dc3a9f8 SHA-1: 7b72cbadacf6b79833b53459dd75ce0277a900fe SHA-256: 9bd5e84f443389c4c26595122a98db9691bda762a2b9ee47ee875ca89212fa49
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are to other PDFs, suggesting a link farm or SEO poisoning attempt. The primary malicious URL identified is https://pelibifir.ru/strik?utm_term=himno+nacional+mexicano+letra+completa+10+estrofas, which is likely used to redirect users to a phishing or malware distribution site. The document body is heavily obfuscated, but the presence of the URL and the PDF_SEO_LINK_FARM heuristic strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=himno+nacional+mexicano+letra+completa+10+estrofas
    • https://roralolew.weebly.com/uploads/1/3/0/7/130775143/3509199.pdf
    • https://domekemukud.weebly.com/uploads/1/3/5/3/135327345/gewusozifuxun_dijopolabodegas_nezejodufe_lurupebexefan.pdf
    • https://tofitumo.weebly.com/uploads/1/3/4/7/134767961/904f64563.pdf
    • https://diluzisapi.weebly.com/uploads/1/3/0/8/130814250/gojirozewewub.pdf
    • https://popoxalisasuper.weebly.com/uploads/1/3/0/7/130775362/1564707.pdf
    • https://kanapajuzusuma.weebly.com/uploads/1/3/4/5/134589940/db59fc7697.pdf
    • https://xokejajolaliz.weebly.com/uploads/1/3/4/7/134718337/vitene.pdf
    • https://sajaxelofokaxus.weebly.com/uploads/1/3/0/7/130776185/28a7e4252ce.pdf
    • https://paxepufa.weebly.com/uploads/1/3/4/6/134640660/b5918.pdf
    • https://kidupexedu.weebly.com/uploads/1/3/4/6/134683121/5035072.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2ae44a4c-2a0c-4258-a4ad-970c970178fc/41422501173.pdf
    • https://uploads.strikinglycdn.com/files/ea9a2c79-3fa8-458b-a0af-fe1abd4ed448/wejov.pdf
    • https://uploads.strikinglycdn.com/files/b017687a-1dec-48ae-bdb2-9c2a40c411c7/mivedemep.pdf
    • https://uploads.strikinglycdn.com/files/296aed6a-48ea-4431-bf95-d488c734ef75/55363072469.pdf
    • https://uploads.strikinglycdn.com/files/81fa85d7-d7e6-4380-9854-02dc50244388/the_african_origin_of_civilization_by_cheikh_anta_diop.pdf
    • https://uploads.strikinglycdn.com/files/9ff44a43-a145-43fe-a306-b003270a2233/tesla_model_3_long_range_awd_322_miles.pdf
    • https://uploads.strikinglycdn.com/files/41dfa02a-ce6d-4444-b69d-d695b47b7658/wevuluvuwolufuranifonagen.pdf
    • https://uploads.strikinglycdn.com/files/b7df0e16-e876-4c51-97bb-a1c6d124220d/66942430952.pdf
    • https://uploads.strikinglycdn.com/files/743bb471-e449-43bb-b3f2-70d2fdc8d888/34142446465.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018052.bin
ec6c536b824bb06b319fef38292fe861be8bbad564cb21f205648d4da6b420fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18052 5384 bytes
font_01_sfnt_off0001928f.bin
df9652d3873b2ec54ee3c326ed4cdfae4e261a4d35e77554b7847991676ba4b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1928F 13408 bytes

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