Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb705165dcd66d5…

MALICIOUS

PDF

73.2 KB Created: 2021-02-22 22:25:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d24dc2f21296ad0d2a2c26d5d67e9615 SHA-1: f2ae095b06d573d941b2c5c0b536eeb41a1c1c59 SHA-256: 4eb705165dcd66d567199a53d50a883890be80255fdd22b44e71490f766f8db5
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to 'How to win chess against beginners', which is likely a pretext to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+win+chess+against+beginners In PDF document text
    • http://form-lnstagramcopyrightservice.com/51356115798ldsl9.pdfIn PDF document text
    • http://goodshopsales.xyz/whatsapp_status_friendship_photoip0v9.pdfIn PDF document text
    • http://guwajokuxo.22web.org/48663345251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488810/normal_60263ec8cb13c.pdfIn PDF document text
    • http://testrun.ru/sowulowepugito2d8e.pdfIn PDF document text
    • http://moneymaya.site/cycling_loire_valley_self_guidedpoq1j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412377/normal_601999f44c2a2.pdfIn PDF document text
    • http://appeal-ig.com/kuropimatejawijexujetok8cqy.pdfIn PDF document text
    • http://chestlune.online/46133836976hoix4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497638/normal_5ff632ffcd9d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kexojupi.rf.gd/brunnstrom_clinical_kinesiology.pdfIn PDF document text
    • http://bisiziwaros.epizy.com/sentencing_guidelines_common_assault_by_beating.pdfIn PDF document text
    • http://damewanobojojo.rf.gd/currency_transaction_report_vs_form_8300.pdfIn PDF document text
    • http://fumidafowinub.epizy.com/30983640595.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FB 5224 bytes
SHA-256: 31b23bf11b20b3e57f8eef469dc9e665b06879b260c0214b2500f67b866e229b
font_01_sfnt_off0000f3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CC 10620 bytes
SHA-256: 4c96d669c517e8e223e36b52a43efce82ae54366b742869467c11db2d1a8d704

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