Malicious PDF — malware analysis report

Static analysis result for SHA-256 bccc818a3a4534d0…

MALICIOUS

PDF

90.3 KB Created: 2021-10-09 13:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d89aa47b95d42323aa007c47b92e1d53 SHA-1: 5d89d3998330659292dd51b758428a3dde9d8c9e SHA-256: bccc818a3a4534d0069f7566f0f1d25ba355fb3e3f2691e27fa7db54e4e64c9e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the overall structure and URL distribution strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://cructi.ru/uplcv?utm_term=collier+county+clerk+of+court+case+search PDF link annotation
    • http://impex-italia.it/userfiles/files/kufifulirotexe.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/20719482690.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/96340494789.pdfIn PDF document text
    • http://yoron.net/up/files/14434219665.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/24512083888.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/mukuwasas.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/petabuwisatupufipazurudut.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/wowifufagesazofekowuruzaz.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/96654115635.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/68680202419.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16152863270a2e---purelanotopibe.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/55288428175.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/86194772550.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/96181380965.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/02/dogixamebowabetitebopakuk.pdfIn PDF document text
    • https://basisnomor.com/contents/files/tinugixu.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/tulibobikerodabez.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/wifiwudokitaz.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/jotus.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/lutejudazidarekiva.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210923062602_1403194885.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/ravezelise.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/ditojule.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/3312786009.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/45688863412.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/naxez.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://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_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 21176 bytes
SHA-256: d3d607f8f351f301b4f3a52667abc8df56de0209c6fd290ea42674027d125317
font_01_sfnt_off00012a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8B 10772 bytes
SHA-256: 286b5b7c6c21e429b0e9e176679a95737e694464d0ee6eac711f1a52b26ea136
font_02_sfnt_off0001435b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1435B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1