Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f71c6386eeb196c…

MALICIOUS

PDF

68.6 KB Created: 2021-10-03 18:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 394b222b8e16ad25245126e635ce09f7 SHA-1: 8282a4d555a97f24f925e93c79ab04022c28fff1 SHA-256: 2f71c6386eeb196c030eb8c348978dab0f388e741fab7b643adc3af2e7bfa46a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URIs, many of which point to disposable domains and are likely used for phishing or to redirect to malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed as a link farm. While no scripts were explicitly extracted, the presence of numerous external links implies an attempt to direct the user to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 4

  • 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://huntic.ru/uplcv?utm_term=speaking+task+2+questions+with+answers PDF link annotation
    • https://tranhtreo.com/images/ckeditor/files/ximupexefig.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021922_20592_147.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/61762428385.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/93340899298.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/78749203061.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/tefuwexajuvipigugo.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/mozabetubedufuvirukolox.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/fojuxamugipewelomukavi.pdfIn PDF document text
    • https://maisonfamillesrimouski.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/rofitiwaviza.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/69438955292.pdfIn PDF document text
    • http://i-physiology.ru/upload/42555428878.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/45031900682.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/73894952442.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/49766061818.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/59843802600.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/pejesunejoguwigaripekin.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/jumatak.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/48640184498.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/48575191955.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/setatojivisixeso.pdfIn PDF document text
    • http://planetamama.ru/files/file/22205686606.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/3187233077.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/xunibozelidulozulipe.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/21331233320.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_off0000aea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BC 11104 bytes
SHA-256: 28e83c12b565e643fdcedf290508bcf4415e573cc309d3874e46e1db26f82c94
font_02_sfnt_off0000e06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06C 14632 bytes
SHA-256: f665dad072c0df4d93e56cf6061b58d4a65869c93805c7ad890c45da68af022d