Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12c0afa963d51b0…

MALICIOUS

PDF

72.1 KB Created: 2021-09-26 01:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6cc919434e649aef0695f3f46e8ff9a7 SHA-1: 88aa78ba894d7f1b14585c71e3b666bfc4b2c924 SHA-256: a12c0afa963d51b092574dc2e1143ad19e40becae072050aac3763c6e10764aa
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is described as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an exploitation attempt, likely via a PDF vulnerability, to execute further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://crysiq.ru/uplcv?utm_term=update+single+column+in+sqlite+android PDF link annotation
    • http://premiercontractinginc.com/files/file/15596808474.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/40329205361.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/68525302311.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/27313356220.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8e58ca30d---46290030585.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/65445586281.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/77302928769.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/fesetesawububaz.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e17d6222e9---85050597282.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/49997929913.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/saduwutogebubu.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/seziwijidikekumavudaz.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/pixar.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/siwinamekuzuxo.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631031184.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/33740679629.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/94478254920.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/bevasaluxupegakebob.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210912072024.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/pamopajilul.pdfIn PDF document text
    • http://julianina.dk/upload/file/piwejil.pdfIn PDF document text
    • https://labelmarket.pl/data/file/panobizapadezapuwux.pdfIn PDF document text
    • http://prosquash.by/data/tofidigisigavik.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_off0000b10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10C 11108 bytes
SHA-256: 83c8caf636659fe503ceba18c60e440812d50b0992cf3ae3dc12afba46fc83ee
font_01_sfnt_off0000ca68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA68 17908 bytes
SHA-256: cac7fe5b2263f9d557ff95b84167af98c8029bbcf425cf45add1b546c6a3351a
font_02_sfnt_off0000f901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1