Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3252b9cf10ea52…

MALICIOUS

PDF

89.5 KB Created: 2021-06-12 08:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6816b96d8438d3314c37dfa225f33164 SHA-1: aa28e655f2358af3e222b6a02564272dccdc44db SHA-256: 6f3252b9cf10ea52e4fdf2164cc88c8b61a937c050b99762484de69e3d04c76b
186 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, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/pbw?utm_term=goblin+market+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448550/normal_600ce91e9a122.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470387/normal_60534de8e1bd6.pdfIn PDF document text
    • https://nalabusapigo.weebly.com/uploads/1/3/2/7/132740218/saxivamezufuk_femitokin_fijamaf.pdfIn PDF document text
    • https://xorusisu.weebly.com/uploads/1/3/4/3/134314808/377911.pdfIn PDF document text
    • https://bejeselujolir.weebly.com/uploads/1/3/1/3/131379719/najasejuxotif-pajutizuliza.pdfIn PDF document text
    • https://lozagazol.weebly.com/uploads/1/3/4/2/134266804/jasuvefidawofokipupa.pdfIn PDF document text
    • https://ponitunol.weebly.com/uploads/1/3/4/7/134747778/8196498857.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460070/normal_601582b1c500f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488141/normal_602e36eeebf4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415783/normal_60baa00813755.pdfIn PDF document text
    • https://rixolojujosu.weebly.com/uploads/1/3/4/6/134622111/781ed1bb2e650aa.pdfIn PDF document text
    • https://tizirabavapamob.weebly.com/uploads/1/3/1/4/131453045/1370237.pdfIn PDF document text
    • https://peramixirado.weebly.com/uploads/1/3/1/6/131637131/jifipijizenavadupeta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383582/normal_603625c9ce16f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478927/normal_600580b67c45f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448357/normal_603a6500c169e.pdfIn PDF document text
    • https://wejatinolu.weebly.com/uploads/1/3/1/4/131438249/3225243.pdfIn PDF document text
    • https://rogasiwenebagan.weebly.com/uploads/1/3/1/3/131380029/79ba4.pdfIn PDF document text
    • https://vomefamatufovo.weebly.com/uploads/1/3/4/3/134378522/bipogagowezikovode.pdfIn PDF document text
    • https://gadikidaju.weebly.com/uploads/1/3/1/3/131379663/5b9eee37a83.pdfIn PDF document text
    • https://jonomivebotuw.weebly.com/uploads/1/3/4/6/134683751/9964567.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf4bff39-378d-4c07-8e30-88a81b4b787d/74227904618.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c091c2fb-4a1e-4192-ad42-0431affb87c8/negomisafogud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b965e50b-07fa-48f1-8d89-1d375918fee3/why_does_it_smell_like_maple_syrup.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE6 5244 bytes
SHA-256: be1a8520e2b3d5888926a735d867de5cefacca37ffb7e78c6aae862b5421c07f
font_01_sfnt_off000120a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A5 10480 bytes
SHA-256: 93ead6547c4c8cfa23f0aee2d0bd4198187496d5e583e1b00435e997d7620b5f
font_02_sfnt_off000144bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144BB 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953

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