Malicious PDF — malware analysis report

Static analysis result for SHA-256 175defd971430dba…

MALICIOUS

PDF

83.4 KB Created: 2021-09-13 01:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c866ac824a573c7ff60cf19a6613f0e SHA-1: 724bdda1b9b21730dd31be59522efd24cf74f264 SHA-256: 175defd971430dbab524f798e0729ddf2f5a7b24d07d205546d45e7676e09af0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to external websites, many of which appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://philabc.ru/uplcv?utm_term=how+to+remove+ringtones+from+android PDF link annotation
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/81574873929.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/870a944eea5084f37d70ead9eea79529/93120873065.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/dinamiwetukori.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/najizogalifojidosag.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/xufif.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/lofodokexun.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/fukisuxagogafiforedolisuf.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/sutisapobibidopogepigobo.pdfIn PDF document text
    • https://theipbuzz.com/images/file/30015022802.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/midulo.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/lanufupawilemamazepitiga.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/438299961.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/17509680663.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/71791966617.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/kuzetunosemonumofigo.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210909_125344.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210906163755630.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210901081717.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/48115221135.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/24695635358.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/wunugubaguzegoza.pdfIn PDF document text
    • http://www.heksan.com.pl/file/gegogutovinatejavonabiwof.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/lajagidipumafugunujope.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/62443394471.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/96581425349.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/buvajokuxidibilajovut.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/s0jnclbgnr5ldsbkjgetahu6i9/76161943475.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_off0000e1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CB 17392 bytes
SHA-256: 104a27369fc54926f35f92c8f582fddfb9e238ae1778001a77356e16c798955f
font_01_sfnt_off00010efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFC 10792 bytes
SHA-256: cd15b5b78cd7dcf7ddfacc5262ed948ef5b864a77356a3bcbda6db1ffe032b31
font_02_sfnt_off000127ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1