Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ebca02621873c8d…

MALICIOUS

PDF

82.8 KB Created: 2021-09-12 04:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ebdfd6db2b8d91f72242c86d5d0b41ca SHA-1: 10e2621517efdc3a8cefe94253060b81d62b30b2 SHA-256: 9ebca02621873c8da742d3ee57d4fb408e5b8cec6a2edd02bf4b00c10060a596
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded URLs pointing to various domains, many of which appear to be link farms or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior, indicating a likely phishing or malware distribution attempt. While no scripts were directly extracted, the presence of numerous external URIs suggests the document's primary function is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=onlyfans%2B%2B+ios+free+download PDF link annotation
    • https://deesudcoolingtower.com/userfiles/file/49342451156.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/fimulazejoxolitip.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/13360015622.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/fizobumiwijexobetawir.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/nupazubite.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/mixij.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/41248806044.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2e9947443---lumisulewivomimarafevowil.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/dapapalafaja.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/zavupemubisuxudasig.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/futemoselufeb.pdfIn PDF document text
    • https://onecre.com/images/content/files/xurirabapaguwiputofim.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/77345516991.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/hhnan6k4m0qnrpqtog6ihc973c/30420438038.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/67128030834.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/zolesox.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/64835204098.pdfIn PDF document text
    • https://adium.ru/userfiles/file/fasitovi.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/42793387095.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/29101093257.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/waribuve.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/pebofaza.pdfIn PDF document text
    • https://cardolf.ro/files/bupalit.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_off0000e0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C2 17376 bytes
SHA-256: 4cd56aefae4be9c51e42bff3709ee6447580ee7de88427683c90146ca9e20d08
font_01_sfnt_off00010d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12576 10472 bytes
SHA-256: e3b159f9bc30f5fc2c3c899fec71d5a6feaa40053ebf21cddc88f0649a8a24ae