Malicious PDF — malware analysis report

Static analysis result for SHA-256 f960b514abc7995a…

MALICIOUS

PDF

78.2 KB Created: 2021-09-17 17:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d640422db3d1b208a092aa60927701e1 SHA-1: e54e3a1add87145773f691fd3c062f0721f5b1e7 SHA-256: f960b514abc7995aad2cb468a9444b6f05f2cfeaff292f1f3d00b3a206097aea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://medvor.ru/uplcv?utm_term=craft+vegas+crafting+and+building PDF link annotation
    • https://karaari.leaddeehub.com/userfiles/files/wusivade.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/lesalenafosusif.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/27449549547.pdfIn PDF document text
    • http://falcon.dk/sites/default/files/webfm/papixi.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/fusasifuti.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/18750672522.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/24661454983.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109130207544194.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/guriwabinebuvojuroja.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/69416474520.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/dojoputekudit.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/dopavuwajetodoniz.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/43943010303.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/govumutonibege.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/65094546259.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/poropakepekulogazesax.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/mepajenegepa.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614225de66323---rukuwutudamopitaz.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/pifozejase.pdfIn PDF document text
    • http://www.pilartangguh.com/file/21840545699.pdfIn PDF document text
    • http://rrarental.org/upload/file/83681537037.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/mimuribiditijinusu.pdfIn PDF document text
    • http://trieuduong.com/images/Download/22401715793.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/gibivex.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/86597296532.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c5e6da5eb---14878784991.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_off0000ce32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE32 16712 bytes
SHA-256: 96e1b01929626f4d2aeaee2811c2de80ab6b44643e4293e04301209184ec5401
font_01_sfnt_off0000f9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 10868 bytes
SHA-256: c4434312e48e9e37392a80b5fb3c31b94382ecb442e19463b151d4577cc7a797
font_02_sfnt_off000112c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1