Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9627702d58dd0de…

MALICIOUS

PDF

70.6 KB Created: 2021-10-01 03:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2321d1594f610bfdcf4f64266e0af516 SHA-1: 9821d70aa7947528761ad605d4c82c1d5a7f2069 SHA-256: f9627702d58dd0de07ed89495a6eb4242178251fd2b6319c15c1222d27b32ffc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a significant heuristic firing indicating it's a link farm on disposable hosting. ClamAV and ML classifiers also flagged it as malicious, specifically as a phishing trojan. The presence of external URIs suggests the document is designed to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://catamma.ru/uplcv?utm_term=cheat+sims+mobile+android PDF link annotation
    • http://aadcnfgl.netsociality.com/upload/files/31985595766.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614022fa2aec9---78978223978.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/vugapawuvonuxexerogigijeb.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/bupilurujawogi.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367dd45d019---96605237605.pdfIn PDF document text
    • https://rodotour.com/userfiles/file/tusabiposavi.pdfIn PDF document text
    • http://chinalabware.net/d/files/37747250374.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/didusodomofelogo.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/11270647794.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/74412100683.pdfIn PDF document text
    • http://arablift.net/userfiles/file/78283834313.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/65922538623.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/66901965890.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/wilunemusurikufulim.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/85135827982.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/95072258776.pdfIn PDF document text
    • https://svilia.restavracia02.com/userfiles/file/76341238498.pdfIn PDF document text
    • https://www.poole.ed.jp/system/ckfinder/userfiles/files/namijuropozosofinigo.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/48899607017.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/darowebedopuwaruf.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/39309641072.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-19-19-48-14-57.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/52135074050.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_off0000b259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6B 16552 bytes
SHA-256: 26558562c10751054e07c2ae7f86bbf6663d9178e32ec2c7fe6d8be5667dfd89
font_02_sfnt_off0000f467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF467 10684 bytes
SHA-256: 019b6cf06993298fab287a459104ec115a8557944ef657a8cdc108a4d9bc6042

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