Malicious PDF — malware analysis report

Static analysis result for SHA-256 f890906248103e7a…

MALICIOUS

PDF

71.3 KB Created: 2021-09-21 01:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f03cd698ccd8a7307f11869d7a513bdf SHA-1: 47f89538c97e937beb021509fd898eefe11e570c SHA-256: f890906248103e7abd557abd736b80fa3a9c7df4346a7abde180f4c4ea1a665a
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 high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are structured as link farms or redirects, suggesting a phishing or malware distribution scheme. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this assessment.

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://archism.ru/uplcv?utm_term=tutuapp+apk+android PDF link annotation
    • http://china-guolin.com/filespath/files/20210908154545.pdfIn PDF document text
    • https://resicolor.com/upload/files/25348638527.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/67923653950.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/77039960965.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/kasejoba.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/bes076psh5719lrbiedvlqgocr/jegibi.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/fiwug.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/2141136724.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/7025158714.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdf9083571---vuwakotebubuxoraworirolis.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/vovetawobinuxibefewi.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109072258243143.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/24804332421.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109110357578424.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/5509793020.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/18051537191.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/4674989093.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/vugejidetatir.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/72385930827.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///45358632720.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/35828903892.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/jufajipa.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_off0000b554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB554 10192 bytes
SHA-256: 963af51fb0e33b7b0f99b975779d6ad45b9074c2fbdc8a065149d7f53433715f
font_01_sfnt_off0000cc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC32 16944 bytes
SHA-256: 87b2eb117961848cb4d4ac144b1915cab862517d31307ff299f1efa1543d1e9c
font_02_sfnt_off0000f7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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