Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9e2f07331cdce0…

MALICIOUS

PDF

82.2 KB Created: 2021-04-11 11:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: edb73bcf890be7fb599a5d28f7f379ce SHA-1: 6d239b2279c4f604339dde737c5152bc3b96c978 SHA-256: 4f9e2f07331cdce03479012f60ba3d37049806026cdbf4adf2b42c0551cba4c5
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, many pointing to disposable hosting or suspicious domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://resalured.ru/strik?utm_term=2019+toyota+camry+se+for+sale+new PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388841/normal_602e6ae960338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404757/normal_600b5f433d9e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481067/normal_605071857c20a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421787/normal_5fc9eb645dcbf.pdfIn PDF document text
    • http://baxijemapuzoxu.22web.org/xusomimot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380890/normal_5fd25ad8b8766.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410018/normal_5fdf2ac3373f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410976/normal_6035d542edc53.pdfIn PDF document text
    • http://sudedelanefozuk.66ghz.com/applications_of_ion_exchange_chromatography.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/liguwubore/98027102378.pdfIn PDF document text
    • http://suvumudupese.epizy.com/41265151705.pdfIn PDF document text
    • http://fevafimavot.epizy.com/cbse_2019_marksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/encyclopedie_des_plantes_magiques.pdfIn PDF document text
    • http://rojinunapubepax.epizy.com/gikelabokefepudub.pdfIn PDF document text
    • http://junopufobapepax.rf.gd/behavioral_treatment_for_adhd.pdfIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_7f54525f58024e2e98d2689f23e4d6c6.pdf?index=trueIn PDF document text
    • http://gilebufamefaf.rf.gd/85828734516.pdfIn PDF document text
    • http://modewomidoxiva.epizy.com/resutudekitunadogelemiko.pdfIn PDF document text
    • https://9329dc78-1a6b-4cc7-98ac-1b36262b7dd5.filesusr.com/ugd/d2be55_e34bcf633e4548848107071e480a9c3c.pdf?index=trueIn 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_off0001021f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021F 5608 bytes
SHA-256: 36e89a139ecbc424126af00202412af866b238ee5d105b70def13ff426fbb07d
font_01_sfnt_off00011534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11534 10600 bytes
SHA-256: 8ff0fef9ea5a755a48b16b8e63583d462f30600f71a3b9dee0364e66fc369fe6

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