Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5c35dee5981924…

MALICIOUS

PDF

74.1 KB Created: 2021-09-20 04:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2179efeae114d045688e13e0f5f5d94a SHA-1: 7830ae5fbc5f39d9f2de6db46c933c8f38cfc723 SHA-256: bb5c35dee5981924b179dd149b5fb3ce768e966d6c4c7520174b0492b1d3da29
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it is part of a link farm designed to obscure malicious destinations. While no scripts were directly extracted, the presence of numerous embedded URLs, many pointing to potentially compromised or disposable domains, suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 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 http://condosworld.com/abisol1/userfiles/files/43313910899.pdf In PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/kabirivalugos.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/13582715686.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/pugamuzesadabu.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/41506779036.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc383a57e4---62345397821.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/46715712980.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/aea78518524c897cb7ad402a9e053877/32915521834.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/nolanepizesurosuxilovux.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/bosuzivalunibiwaronawawop.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/gavexakaxuf.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/sisinajiked.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///xaron.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/91154566540.pdfIn PDF document text
    • http://digifast.cz/userfiles/72281498341.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/lorizugo.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/zorevotezukuguwaw.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/didowodajakirevokuki.pdfIn PDF document text
    • http://15881588.com/ckupload/files/98151389393.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/16428399699.pdfIn PDF document text
    • https://armenia4d.com/contents/files/5198848105.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/72896572760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=my+hero+academia+season+3+online+subPDF link annotation
    • 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://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_off0000beb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB3 11056 bytes
SHA-256: ca243db4b05b68c8ced158b980f46c916454b3bfa97339626719bdcdab46035c
font_01_sfnt_off0000d844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD844 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF056 16480 bytes
SHA-256: a4dcc767b53432b16e5bd226ef6b2ad2c562c702c814ffe3bb29ab9bcc698c53

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