Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdec6ad712d7ca3f…

MALICIOUS

PDF

83.5 KB Created: 2021-09-24 04:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3741c92b12ffb8c3ab8e575a3de21705 SHA-1: 1b3815e7ca0a1bc34baf3a1d6ab031e79e819491 SHA-256: bdec6ad712d7ca3fdd8d40a4a4af5626424d6bebeee67d25526bdcea487a18b3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs pointing to a link farm hosted on disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or a scam. Although no scripts were explicitly extracted, the presence of embedded JS streams and the nature of the URLs suggest a potential for malicious JavaScript execution to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pensjonatagat.pl/userfiles/file/44288534260.pdf In PDF document text
    • http://oilmachineydy.com/d/files/rimowixaxovizizazevuw.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/lagepobinofuf.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301f3f74bfd---64874282760.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/dotolesodel.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/38046957167.pdfIn PDF document text
    • http://surtek.biz/image/files/20150324_225725.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/68352170620.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/kimetabulog.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/dekibupu.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/kozol.pdfIn PDF document text
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/balutero.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/17619382231.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/15516195645.pdfIn PDF document text
    • http://cbstav.cz/file/topigur.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/35693630259.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/zijulonetewekesimap.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/91561226366.pdfIn PDF document text
    • http://banquat.com/userfiles/files/55758051410.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/fafekajisupowizuf.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/12759479980.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/77052012421.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/dekodagixa.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/0c29f50de8375b0db18a3767c8a9484a/11940575932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=animation+software+free+for+androidPDF 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_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF1 10536 bytes
SHA-256: 0608e1ead811e2b4828ab8fd719114182200ff458740cc8032c33a5f80a7bde5
font_02_sfnt_off00011307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11307 17416 bytes
SHA-256: 32396029cdab0ddf4f66b76d232b0548e8f0af3425275b6f94b39e6b5b3052f9