Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b4cb73fe39a84e…

MALICIOUS

PDF

80.7 KB Created: 2021-03-14 10:16:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3a0e4556d8bbeea7894c5d93331ab7fa SHA-1: 3a3b46e2b6e24d0bfe8d1ed40660f84c5f8d4992 SHA-256: 63b4cb73fe39a84ed72b425625145efe1deecc467cf9daa11347fbad0f6b5eb2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links pointing to other PDFs hosted on disposable domains, a common tactic for SEO spam or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the structure suggest the primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://xajibur.ru/wix?keyword=akito+the+exiled PDF link annotation
    • https://wisutusetuma.weebly.com/uploads/1/3/4/5/134524637/116780ac4bd411a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451970/normal_603dd82d4cd84.pdfIn PDF document text
    • https://bikepudebap.weebly.com/uploads/1/3/1/4/131405977/duwopabi.pdfIn PDF document text
    • https://poxigupi.weebly.com/uploads/1/3/1/3/131398264/19a76.pdfIn PDF document text
    • https://rixagaxovexi.weebly.com/uploads/1/3/4/0/134000332/pikulawuxojopinexune.pdfIn PDF document text
    • https://cdn.sqhk.co/bisulalu/he3hiKS/skyblock_addons_mod_1._16._1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476285/normal_6006b98f558d1.pdfIn PDF document text
    • https://kusejatakobex.weebly.com/uploads/1/3/1/4/131438299/2704336.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492250/normal_600f4b607c589.pdfIn PDF document text
    • https://gipewiraxo.weebly.com/uploads/1/3/5/3/135334151/d877825def.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386347/normal_60446e568b866.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuwatipo/qIhedCa/ios_13._2_developer_beta.pdfIn PDF document text
    • https://cdn.sqhk.co/jevipugirofi/gdgda9o/paremutufuzuxejoforiw.pdfIn PDF document text
    • https://wamazuwo.weebly.com/uploads/1/3/1/3/131380988/xigow-vamozadige-sodudeko.pdfIn PDF document text
    • https://werobipopopavuv.weebly.com/uploads/1/3/1/1/131163729/keguvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443576/normal_604689c49676e.pdfIn PDF document text
    • https://xegejigavo.weebly.com/uploads/1/3/4/8/134883842/b1c6a9c6187efe.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/tolivajupeku/is_fairy_tail_anime_appropriate.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/gaken.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40F 3684 bytes
SHA-256: 589a88b7f5c8555647a1add0912f17899b26d6c850f1d2f3bc12ea41b2b8ca76
font_01_sfnt_off0001012f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012F 4548 bytes
SHA-256: 0cebd3fba3f85248a5479ff43b61503b752831d50f95f6c42c490ba7cafad3bd
font_02_sfnt_off000110a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A9 10880 bytes
SHA-256: 24881a70a0137fc3194cbc2e2ab3db57780ce8c9db536f26fba81a3fdb54f980

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