Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8adb2bcaac0fa9…

MALICIOUS

PDF

82.3 KB Created: 2021-09-08 21:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a4b44a3acf7fccb05b2fc53ab5220b90 SHA-1: bf25a481edc4d802ced07b4e411038500bef281a SHA-256: bd8adb2bcaac0fa9fab106aca81605d22c1c230d8545fac44f7d4bb8024e2012
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to various domains, forming a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133caff27408---dusem.pdf In PDF document text
    • https://visualmotion.nl/uploads/file/jubemifupobanunet.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/20767456797.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16305402782078887044.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e752bf8bd---dalet.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/mukejoguderojedezet.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/vekuvigelasuras.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/jowajidawuz.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/joneguri.pdfIn PDF document text
    • http://apex-architect.ru/images/file/19896371202.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/58215512700.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/satixizugibuzodataf.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/87658574688.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/66394666230.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/melef.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/vuronaziti.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/33652930608.pdfIn PDF document text
    • https://wonkingchina.com/d/files/22746883461.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/34509637892.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/55510642355.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/16210543582.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///daxivitipugasotezipapule.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/kotuxuvawizokenulaferu.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/61547969549.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/74631384028.pdfIn PDF document text
    • http://arucax.am/user_images/file/53029996497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=1+dm+video+downloaderPDF 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_off0000de85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE85 17944 bytes
SHA-256: 59f5b94c9b1d54ab4eb385901f21b363968887e5dc2cf1d8c38679f721000ac2
font_01_sfnt_off00010cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDF 10252 bytes
SHA-256: 6ab80079fee9a3e41ae9a03a40c7bf6869c024d4912127c6125663740eeaaf1d
font_02_sfnt_off000123e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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