Malicious PDF — malware analysis report

Static analysis result for SHA-256 14aa09f86c4e0d51…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 05:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 46f5d3f1c0ea472b428c1d29085713c9 SHA-1: 75bfcbb77226c01649d092a751e9aab78c443a30 SHA-256: 14aa09f86c4e0d51886ccaf16233b2fe502ccc9539cd7b3a7b337aa278f47cd2
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 heuristics identified it as a link farm with numerous external URIs pointing to various PDF files hosted on potentially disposable domains. The primary purpose appears to be directing users to a network of sites, likely for phishing or distributing further malware.

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://cardolf.ro/files/27439770777.pdf In PDF document text
    • https://lawrenceyezersky.com/userfiles/file/61287859370.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/hs8gjap0ptvpccm1d5hjaind68/44750012792.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/33932545124.pdfIn PDF document text
    • http://keramann.ru/uploads/files/61230448137.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/tupemeroza.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/sadejeroxexirefagewalen.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/xofivom.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/jagivigisarevusukem.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138cf29c6902---17094691523.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/68898176321.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/355282347.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/78904599861.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/17071048405.pdfIn PDF document text
    • http://chayka-svg.ru/files/94854527934.pdfIn PDF document text
    • https://senfina.top/uploads/files/62470854835.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/83892661506.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/lakebejipan.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/bobumaxabomaxakuluku.pdfIn PDF document text
    • http://atek-ent.com/upload/file/6747795450.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/gazomitebekaw.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/sapegakutefogerofuz.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/lobeluxodoxazupasun.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/wiwimazezofivison.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ppsspp+modded+gamesPDF 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_off0000d6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC4 17620 bytes
SHA-256: 730cbefd4b8c6ca8b18879e3812784d162434b30d87f02d23e224d2cac56bece
font_02_sfnt_off00011bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC1 10296 bytes
SHA-256: 77deb34da28b5824d4764a82104ec220d63354f67db5d8a4ac9ca714f6271d2b

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