Malicious PDF — malware analysis report

Static analysis result for SHA-256 46a71eb8b50d09e3…

MALICIOUS

PDF

77.8 KB Created: 2021-10-07 08:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2dbbce3569bb7d9d4cb58d352840f6ad SHA-1: 785c147f246869c753cb75ebd4830ba6d3430d74 SHA-256: 46a71eb8b50d09e3bca10bbeafb5cd8683ff5346caa173322805e5fabea76382
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's purpose is to host numerous links on disposable domains, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of many external URIs points towards an attack pattern involving redirection to potentially harmful websites.

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://inwebjor.ru/uplcv?utm_term=household+bugs+with+pincers PDF link annotation
    • https://mklaassen.nl/images/file/89418100788.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/bimovovodimimane.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/29438282585.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/97327901694.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/majalow.pdfIn PDF document text
    • https://12shio1.com/contents/files/buxokomo.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/38000787160.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/48017418229.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/kikugefo.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/48190545027.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/nifidu.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/97985696425.pdfIn PDF document text
    • http://iphysiology.ru/upload/46183203996.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/45341189619.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/xanexadasudorawikajut.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16153e9e18dc38---xilopodisanimixi.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/fapusepupaniwatabubisijit.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/90882620698.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/bopegan.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gutovijadomabom.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/mewajomunaxofegabibufedem.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/8ukhdg2csncrjd3tp1c81g1ia1/39480454036.pdfIn PDF document text
    • http://www.bash.cl/media/file/rozarudibilug.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_off0000ccb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C3 17192 bytes
SHA-256: 37d608b34f9a4b3085e2d3ea76ac2355886b22cea9ae9bd7acb7514fcf576987
font_02_sfnt_off000110fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FA 10948 bytes
SHA-256: 9a035ec16d00e56d26f1fbce4f7ea142ea2438b0d7b2aefbc6e2520b1e504743

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