Malicious PDF — malware analysis report

Static analysis result for SHA-256 9efa4acb810bbddc…

MALICIOUS

PDF

82.5 KB Created: 2021-02-14 22:04:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 72581950a762773b8523bf981920df62 SHA-1: dfe6dfe490abffb686c5394c4875c2839d441d66 SHA-256: 9efa4acb810bbddcba6aa875d0a94f830ae3c98b6345afaaf87951ca4a299a13
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on Weebly and other platforms, suggesting a link farm or SEO abuse tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of a phishing or malicious content distribution scheme.

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
  • 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.
  • 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=eso+march+of+sacrifices+guide+normal PDF link annotation
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/8924469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369930/normal_601ba9403662b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450511/normal_5fe645f5900b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380707/normal_5fc69f2cbcaf8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446512/normal_5fce608489389.pdfIn PDF document text
    • https://vidokabotofasi.weebly.com/uploads/1/3/4/8/134868814/2604316.pdfIn PDF document text
    • https://nuranisemamev.weebly.com/uploads/1/3/5/3/135324344/wanazoxis.pdfIn PDF document text
    • https://dezijetide.weebly.com/uploads/1/3/4/8/134864221/8853899.pdfIn PDF document text
    • https://mukuriwubi.weebly.com/uploads/1/3/1/4/131483253/383105978a.pdfIn PDF document text
    • https://vufosaxirit.weebly.com/uploads/1/3/4/0/134018891/natagafawoloxoborut.pdfIn PDF document text
    • https://dubiriji.weebly.com/uploads/1/3/1/4/131406762/693998c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410204/normal_5feda5d309f8b.pdfIn PDF document text
    • http://pozerebidilu.iblogger.org/56068418912.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393624/normal_601b835d2da3d.pdfIn PDF document text
    • https://silodadut.weebly.com/uploads/1/3/2/7/132712229/96930.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428083/normal_5fec2e0be2a39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off0000f36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 5196 bytes
SHA-256: cf0c9ed2ad9768f60453baec89758219ea551d6e6e8993104cd275913f7191fd
font_01_sfnt_off000104e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E0 13176 bytes
SHA-256: d606c8b226fb0c0b048d2463dd72300ef58080b5a92edc460d8dd0a1959c98c1
font_02_sfnt_off00012e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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