Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2dd1b9042293fbe…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 06:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7eb30a4d4c20147d9d0cef38b84d1fb6 SHA-1: ac78a1a4134cc652cc05ebbb5f08ec90a94f8f5c SHA-256: e2dd1b9042293fbe8c9eb84e708d1dc90497b15d6b04daf8bf9a395695133fff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a large number of embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or spamming campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the sheer volume of external links suggests a primary function of redirecting users to malicious sites.

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://crysiq.ru/uplcv?utm_term=instagram+followers+fast+and+free PDF link annotation
    • https://bimstudioinc.com/media/files/wexivebojafenovexebikepu.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/xexupobemaz.pdfIn PDF document text
    • https://loctra.net/userfiles/file/29823848601.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/34264535454.pdfIn PDF document text
    • http://bndweb.nl/upload/files/jevot.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/6468194829.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/xupojelenifagonafu.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/kararorogumumeminesurex.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/53493964974.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/zelitabipasapemiwum.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613907f79ae15---5197090908.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/24860284081.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/najigij.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/95511272918.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0921/0551d1efc3eaf632f590e9a51697e9ec.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/rubefetunulenolozetisi.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/refodi.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109072116097361.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/9260161341.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/27471248638.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/jixidixulusikorujunon.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/97311740376.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/vigiwimipinosuvifimoni.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_off0000b3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FE 16376 bytes
SHA-256: bd791020dadafc797cf55bd34368031387db663bb13efd84a44054f18b8bd42c
font_01_sfnt_off0000dd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 10644 bytes
SHA-256: 05227a9a893a922d8df29ac56b331ee0c1549c9536d0e32b2aa9b099f65c63a0