Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e485b6af7d2a2bb…

MALICIOUS

PDF

80.4 KB Created: 2021-09-14 11:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 70c6f2c00463dc3a8dd95bc8f658b6f6 SHA-1: 06bcc9fd3c6d01db952a3f39d159018841a2d2de SHA-256: 1e485b6af7d2a2bb5bcf35638052717b72ae63bfaa512b9758b936a619cb4f08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable domains and acting as a link farm, suggests a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the overall structure and URL patterns strongly indicate a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://philabc.ru/uplcv?utm_term=mcpe+latest+update+apk PDF link annotation
    • http://polenes.cl/userfiles/file/65835618559.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/vusesosa.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/kiwusazugopizasuw.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2f1545341---45424915383.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/22407449053.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/gurobimigurujezo.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/27450221425.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/56890032962.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/desogebu.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/xodezexija.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/73555436879.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/50369059344.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/83002431878.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/labosakanujik.pdfIn PDF document text
    • http://4bx.pl/public/file/11218655670.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/75725447350.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/7068147793.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/tiduni.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/lasunegamonera.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/93231789798.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/560d37a6d0637af96fba811e2d5a1e10/38644627240.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/19892667395.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/94859178855.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/nojudananefazipuneludaxuj.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_off0000da8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 16344 bytes
SHA-256: 48a6f592239c6a5e176e349ce6bebda85f1dcc514e89e1accfd42713305930bf
font_01_sfnt_off000104ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AD 10276 bytes
SHA-256: 3c545277ff5b3c13d1729279dd7834cb4c1fec68ca3595daf0a2fbf8370feb4e
font_02_sfnt_off00011c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1