Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a5f1bc39191876…

MALICIOUS

PDF

68.7 KB Created: 2021-09-12 07:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1d8724f97dd77de3e6141a6b2c4394b3 SHA-1: fadf7e03c207b033eb066d67d5fdac4ada20ff44 SHA-256: 17a5f1bc39191876a3570338a3c25ccfe43cce3e5320fdd5b7f9258136436029
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, one of which is hosted on disposable infrastructure. While no scripts were directly extracted, the nature of the link farm and the detection as a trojan suggest it likely exploits PDF vulnerabilities or uses embedded JavaScript to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://portalcom-b2b.es/img/user//file/_0888941001631054307.pdf In PDF document text
    • https://mytekas.com/UserFiles/file/8573407666.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/nivazali.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///zagetuzugupa.pdfIn PDF document text
    • https://ever-progress.com/upload/files/melemujika.pdfIn PDF document text
    • https://inarsindbari.org/uploads/fusijunonosev.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/98104280980.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/sefuwaxogoxedefobu.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/jiwuxuwaj.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/19850495122.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/fofajamewesux.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/kirebisunopuzakape.pdfIn PDF document text
    • http://archbot.pl/files/file/jaselobagefatudisidizelof.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210902041916.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/60066334498.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/38211368298.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1e80e331d---53820471084.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/79901844992.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/8100641179.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613630e00b623---61967361869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=best+compass+app+for+android+2021PDF 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_off0000aee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE6 11080 bytes
SHA-256: 93ce891489790bb839452f3d7e03b70f0123e23de9c21dc9a822608042edf82e
font_01_sfnt_off0000c8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D5 14664 bytes
SHA-256: 0013ecae4f479ca25f04950754ab76a5adbbae0d150b9bb568c704488017cb8e
font_02_sfnt_off0000ed14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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