Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17dfc36a7c09726…

MALICIOUS

PDF

94.7 KB Created: 2021-09-13 23:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b154b91e2253ecb87d9c1a688827c87 SHA-1: f02af59044e26b1f350846702608c61220b81392 SHA-256: c17dfc36a7c09726f0f2a96b8b16c230ed64dea5db8b66270602223b16c611dc
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a link farm, hosting numerous links to other PDF files on disposable domains. The presence of a URL with a 'download' query parameter suggests a lure for users seeking software. While no scripts were directly extracted, the ML classifier strongly indicates malicious intent, likely related to distributing further payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=download+resident+evil+1+remake+android PDF link annotation
    • http://giteduguedesboires.fr/userfiles/file/zimot.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/48145650405.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/29933764061.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613346edbc3e4---ligiz.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/putezivegixid.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210904_069421830FF0EB88.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/55127221650.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/4749598144.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/17891763564.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/5680175872.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/43208926698.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/89381292759.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/dodokewopipemobijoledidu.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9c1c4cdf0---gizononujimi.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/xurazevo.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/1181757558.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/14045886664.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/tunufiminisubav.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/24314416681.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/lenega.pdfIn PDF document text
    • http://aurora-c.jp/files/files/63778985845.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/7053981785.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_off00010a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A42 19824 bytes
SHA-256: ff77779428c791d0f1ccbcde6170e7a23525fdb68c42067fe4a4983e21cd2df1
font_01_sfnt_off00013ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000154e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154E6 10708 bytes
SHA-256: b7fe6bb4a249138a76b2a964072615b4f194963eec581eea110f200ca288fe15