Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f445bccb9055a32…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 13:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fc77f1bc8e63b1bcd89cb87e77f08921 SHA-1: f23b5b210d610bf91be3d8e51dd71c6840b665ae SHA-256: 8f445bccb9055a32a493494fcfb878f339d76dbb196695cea9ba0aa924764730
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to suspicious domains, many of which are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing and trojan activity. The presence of external URIs and the overall structure suggest the document is designed to redirect users to malicious websites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=turn+on+find+my+phone+android PDF link annotation
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/bosifisinaziredexoleded.pdfIn PDF document text
    • http://4darchitecture.org/img/all/88979309954.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/37635881779.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/dapekudomisagonilexamip.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/85414339052.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/wexalukegis.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/fobelitepilerolas.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/rokukuleraxajiden.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365fcb1679c---letepuriwulafave.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/zirejitofupu.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/84054478028.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/55054642955.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/fimejobij.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/14903756994.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/vofetiwafiju.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/18856563209.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xaripalapalogixeto.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/90936206824.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/94949883424.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/pudusenivarimatikotamiw.pdfIn PDF document text
    • http://hanifeugur.com/image/files/lewoparowirolakur.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/1120725915.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613043b047544---babowozurarememulewuxudi.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/lodopusonilefokewo.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/bixaxerina.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_off0000e179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE179 17916 bytes
SHA-256: a73698894a0d731b4bb8816152948209509133581cf06bb5f129f7065c0db656
font_01_sfnt_off0001106a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106A 10628 bytes
SHA-256: 49e6afe8b681860095fac7031705c5939191d7b0d3d82aff593626d2c7c30dfa
font_02_sfnt_off0001287f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1