Malicious PDF — malware analysis report

Static analysis result for SHA-256 7179c197471ce664…

MALICIOUS

PDF

72.1 KB Created: 2021-09-13 18:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b39a4d9bfc12ca0a70bf873b0ddbf87 SHA-1: de872e21354d174f412c40d5d6bfee2ba82edae1 SHA-256: 7179c197471ce664a102923c63d4e28d72814f79e0f191c9afec9dd8a0d5a5c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attack pattern focused on redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://akinmedical.com/uploads/file/29443158170.pdf In PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/9054720523.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/64353596022.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/mijufugedave.pdfIn PDF document text
    • http://agavietnam.com/img/files/69679011809.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/524769181.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/38191830347.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/lulunugovazogikeduwap.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/25451730212.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630849658.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/85119589843.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/juruwopatenibumix.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161332f8a090ec---56409772920.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/badutufedop.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/58100572186.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/35586468036.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/ramibowizukumuwadolevife.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/ronex.pdfIn PDF document text
    • http://hueide.com/upload/files/3539654313.pdfIn PDF document text
    • http://irollee.com/userfiles/file/wilazobofepajarilela.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/pogumizijawolafisagosatuj.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021091221345377.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/68543785647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=android+root+app+downloadPDF 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_off0000b928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB928 10152 bytes
SHA-256: 9fdb6181b6da396909e8b1ff5b6717afdc3d9dc69e073bd36edfc33918c9b1d0
font_01_sfnt_off0000cff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF0 16704 bytes
SHA-256: db4ae8586d26e94353fca5c271e5b79a8edde0cc10fe309adab5f0149055d0c0
font_02_sfnt_off0000faa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1