Malicious PDF — malware analysis report

Static analysis result for SHA-256 e801038f26264f59…

MALICIOUS

PDF

72.8 KB Created: 2021-03-01 12:50:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77701b91e9a11583c56631a8b8d0b919 SHA-1: 9a991dee84960d133aeed2d5c3557041c9322382 SHA-256: e801038f26264f59a66095bd3c28a621306b9e6d434ee2842c12a8d533d490c3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive external links are indicative of a malicious campaign.

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://resalured.ru/wix?keyword=newton%2527s+laws+worksheet+8th+grade
    • https://cdn-cms.f-static.net/uploads/4411220/normal_602019848124c.pdf
    • https://static.s123-cdn-static.com/uploads/4465131/normal_60035a726a3d6.pdf
    • https://sezavifibeka.weebly.com/uploads/1/3/4/4/134463458/2613081.pdf
    • https://cdn.sqhk.co/pafevola/jfjcRge/huawei_health_app_4._0._0_download.pdf
    • https://cdn.sqhk.co/mudonisogub/MHhi29s/19520588607.pdf
    • http://bixuvetojotenes.22web.org/hard_worksheets_for_kindergarten.pdf
    • https://cdn-cms.f-static.net/uploads/4481067/normal_60392817154f0.pdf
    • https://nozijuga.weebly.com/uploads/1/3/4/6/134698325/lelagamadiva.pdf
    • https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/af07ef7.pdf
    • http://ouily.xyz/soboragiskgt3r.pdf
    • https://cdn-cms.f-static.net/uploads/4367646/normal_6009cdb9d0a51.pdf
    • https://cdn.sqhk.co/fasazani/ghpjeZv/89041958255.pdf
    • https://cdn.sqhk.co/lojulifuvuxu/iehdeyt/larul.pdf
    • https://cdn-cms.f-static.net/uploads/4453734/normal_6021555a0cc65.pdf
    • https://cdn-cms.f-static.net/uploads/4383147/normal_603c882d0e0dc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://daxepusiz.rf.gd/85991587319.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_off0000dfbe.bin
7b343e8e452a705bf2282e742169973ec01705f95b3c20ee0f4b37b4e1982ab2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBE 5440 bytes
font_01_sfnt_off0000f252.bin
55e65850006ede07cdfff7989688252ea879a9c911490a93c91c32ae02e4d7d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 10444 bytes