Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba43314e0e64b3c…

MALICIOUS

PDF

94.5 KB Created: 2021-09-22 18:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b5255c060f88b3197e0f698886124f3 SHA-1: ebfc5a1de3e0b1dd6962953799cbf55ab9fa6167 SHA-256: bba43314e0e64b3c9900602eb7c3f22c76e687e6d34255b6169e5cac2b44524c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to a link farm, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies the document as a link farm on disposable hosting, reinforcing the malicious intent. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://foodexgida.com/uploads/files/62845074812.pdf In PDF document text
    • http://cuspsurgeons.com/userfiles/file/zedexavixura.pdfIn PDF document text
    • https://atavio.ru/files/file/siremomukosifiwixapixef.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/sofezogabok.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1128482556614af3c6138c2.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/38072968125.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/95791717811.pdfIn PDF document text
    • http://khocabien.com/uploads/files/63640024475.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/74916688506.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613576b9d62a4---vokuxezalezalixidet.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/45522515055.pdfIn PDF document text
    • https://techlan.pl/files/file/7534350642.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/maninovovowu.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/lirazojajinosarixef.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/43660996286.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/serida.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/noxovumapikevo.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/28691851372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=speakout+student%27s+book+answer+keyPDF 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_off00010270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A87 10888 bytes
SHA-256: f0787a0ff6992dbebc493b882e2ef5a64b2b74607b1ef960fd05353f03e103ae
font_02_sfnt_off000133c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C3 22036 bytes
SHA-256: 4210c2efe798eb73338d1bf16f4c364c2a1a4c5a4174107510778cc451957446

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