Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fcb81b67666516e…

MALICIOUS

PDF

71.1 KB Created: 2021-09-27 10:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c8fc1504f971fa8fc9de8e6d40c92bdc SHA-1: 94c8e8961c4e417e0f93fa4a6a01da0a2df6d308 SHA-256: 8fcb81b67666516ea468400038c8057a5d6edae139a57bfbb200f83b42ed77b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to disposable hosting, suggesting a link farm or phishing infrastructure. The PDF's structure and embedded URLs are consistent with a phishing lure, likely attempting to redirect users to malicious websites for credential theft or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://irlanc.ru/uplcv?utm_term=bt+notifier+app+for+android+smartwatch PDF link annotation
    • https://tepihtrava.rs/files/25875456517.pdfIn PDF document text
    • https://bem-sa.com/img/file/62644805340.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///57242321097.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/polisotadodirujubujus.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/329952202.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/62212959760.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/32622886197.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/nunisada.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/76863484099.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/gerotusi.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/duvikogateli.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/92898469582.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/78116574682.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/kimoxosaxedikofaxotofo.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c9631a3e809f01f29549c9809156320b/webupoxexasowalijodeviz.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe4c36368f---zutafekonipagalafi.pdfIn PDF document text
    • http://ippon.lv/uploads/File/zagejira.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/82313504200.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/xorowokipek.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/6093667923.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/butotasedetisawowegipuwal.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/lugaw.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_off0000afd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EF 10980 bytes
SHA-256: c31a319efda87fbcde9bad8ee43286a5ecf47cc05eb611390fbcef4589d87aa8
font_02_sfnt_off0000e156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE156 17792 bytes
SHA-256: f1b36d104f91d7e33af70315b2a00dd1215f1837785d7038fe9e40fdd43cd421

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