Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac8743d2540304b…

MALICIOUS

PDF

80.4 KB Created: 2021-03-29 23:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aec610761cb3ece71789ad3c44e00f93 SHA-1: 2cfd8479e55b7bcc4f7d17b63801b16ec501c996 SHA-256: 8ac8743d2540304bf8ce5f91167a572121472732ffea93649478288e8b0666e5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the structure suggests the document's primary function is to redirect users to these external URLs, which are themselves likely malicious or part of a larger malicious infrastructure.

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://bologen.ru/wix?keyword=birthday+wishes+for+navy+officer
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/lizuve.pdf
    • https://ledosixekesi.weebly.com/uploads/1/3/4/3/134313849/dositufapisan.pdf
    • https://nozusetemakofam.weebly.com/uploads/1/3/1/4/131408546/kobevi-wexalapulez.pdf
    • https://lipazugarajoko.weebly.com/uploads/1/3/5/3/135318447/c032f9.pdf
    • http://keburej.22web.org/sedigibonavopuzafovo.pdf
    • https://lomewulepizava.weebly.com/uploads/1/3/3/9/133999744/3338437.pdf
    • https://topasotasakaro.weebly.com/uploads/1/3/0/8/130874498/nukoganaj-kariluk-kizigokit.pdf
    • https://kokubuzo.weebly.com/uploads/1/3/4/0/134017800/xirepuganolibeb_fanozapabarogu.pdf
    • http://sugebowupubixo.mypressonline.com/blender_2._79_download.pdf
    • https://falufanimuv.weebly.com/uploads/1/3/4/3/134377488/375921.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gozenabuzixi.onlinewebshop.net/42584709284.pdf
    • http://bowedujo.rf.gd/48952476932.pdf
    • https://uploads.strikinglycdn.com/files/e4218cef-f940-424a-96e4-dc529516c829/el_diario_de_greg_2_pelicula_completa.pdf
    • https://uploads.strikinglycdn.com/files/773443b3-e8e8-49ad-b0a0-549fe6b43ca8/how_to_calculate_the_tds_interest_on_late_payment.pdf
    • https://uploads.strikinglycdn.com/files/6baef331-abf0-4504-8179-f05a6ec19f86/gekupat.pdf
    • http://vulomalizekuvu.rf.gd/13438154460.pdf
    • https://uploads.strikinglycdn.com/files/c36311ed-f7b5-4442-8c06-91abe14e8493/50180788014.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_off0000fbeb.bin
fd112f017a6f9b7bea3ca722f540ce6b1fb27ed36e9c09de403b809cf2262109		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEB 5380 bytes
font_01_sfnt_off00010e53.bin
0bb9985f5580204177bc047646408ede71c2b354ed1f1d0e13dc6e3a974288ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E53 10784 bytes

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