Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca130315b176b0d…

MALICIOUS

PDF

75.6 KB Created: 2021-09-10 14:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: b2e05ae12c178ba50a3f4336a408f923 SHA-1: 2c9d3241daefb61d7654b23b601a725b2c756d2a SHA-256: dca130315b176b0d39778a5cad56b8581b8b6cfed140074972c24a67b8eb5cc6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://gyndoktors.de/ckfinder/userfiles/files/5079087864.pdf In PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/98527735059.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210908045035.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/xaveniguvotofago.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/jederobodobenek.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/bamafuderebejanusexili.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/neserisolipowupu.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/60072123096.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/19818209318.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/wazobela.pdfIn PDF document text
    • https://sambelteri.com/contents/files/15787824479.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/15316967829.pdfIn PDF document text
    • http://sjanzee.nl/file/42895706411.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210907205028181.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/86094007443.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/54026871923.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/12450597533.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_10_14_38_21_9608.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/lukatutafi.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/tinekufenezoxarebeti.pdfIn PDF document text
    • https://shidoremicrosys.com/media/palujiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=running+man+ep+559+eng+subPDF 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_off0000c1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D8 10816 bytes
SHA-256: 1d3e1ab9c961d1076aeb43f00f827e82d9a489a89ff35e85ec96cbc884d00d60
font_02_sfnt_off0000f28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28B 17716 bytes
SHA-256: 7e50dfbe76bc4f0671a1f22faa551d6a63115e192b1fe291c862a6796b51aa36

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