Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d10652663739a0…

MALICIOUS

PDF

77.0 KB Created: 2021-09-20 08:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e31cc27ea955f5ff35cdc44c8138c80c SHA-1: bc11d11fe9c66a8ab03f7a2a3bf0cdc6426615e5 SHA-256: d6d10652663739a087b7764c3210d0f1541e819e57ae2a722730d84d0658c8d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, strongly suggests a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the nature of these links as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://broadgatecapital.com/userfiles/file/27715690418.pdf In PDF document text
    • http://www.puhito.hu/uploads/53396239774.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/68tljdvc95p3b6vt7ts4rc3310/tononirumujavawipe.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/gafenofolaxuranubota.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/64664820305.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/33391321135.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/kenewawopu.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/35472068237.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/36436096395.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/gagibizid.pdfIn PDF document text
    • http://martonelektro.hu/files/file/44778358145.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56782507526.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/36656794250.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/xuzovulisubatiwer.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/43098455462.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/merigolixolanutamexefiko.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/xelexofinalef.pdfIn PDF document text
    • http://24cvety.ru/upload/files/81470295583.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/fepuwov.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/56394074819.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/kupade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+cinema+hd+on+firestickPDF link annotation
    • https://lapdonline.org/file/lonuj.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_off0000c81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81A 10864 bytes
SHA-256: 2e66360c69b43a37684dc40d45c69cb380c4a8d9226d44c690e90d711c2c70e3
font_01_sfnt_off0000e108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91A 17612 bytes
SHA-256: 8de87f29d50d48c91ca5cdae59865ae858a7ee876733c144730373fc25834705

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