Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee2c51a47597820…

MALICIOUS

PDF

88.7 KB Created: 2021-09-13 13:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 763bffcd408a5f01fa3b05b40e10c4d6 SHA-1: 8e6036d098b332905e9559e9148ab06d9acf6a25 SHA-256: 8ee2c51a4759782073f06162791ac95ac9960ad2555feed69b9ec3367d12b099
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. The PDF contains numerous embedded URLs, many of which point to disposable hosting, and one heuristic specifically identified it as a link farm. While no scripts were explicitly extracted, the presence of numerous URLs and the overall detection profile strongly suggest a phishing or malware distribution attempt, likely leveraging embedded JavaScript or other PDF exploits to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/29285321867.pdf In PDF document text
    • http://everestlodgelukla.com/userfiles/file/47651259095.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/pulibud.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/25794688668.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/roxibizokim.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/lekujuselefulo.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/82042959766.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/degedijinotij.pdfIn PDF document text
    • http://byecook.com/ckupload/files/rozevaparovunerabiw.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134064346acf---jamipavazozekobonisu.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/48131759801.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/bukirerabikowifematati.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/89428342960.pdfIn PDF document text
    • http://metallpress.ru/files/99121123790.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210905211002_xps9g8.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/46849267212.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/jabuzawos.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/9421962029.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/resenusite.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/7453390279.pdfIn PDF document text
    • https://artenika.pl/fck/file/gudumapumudedigutezeko.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/wagemufuropofadumagizi.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/62389973787.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/77607695942.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/vimajaxomogikumime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=tensei+shitara+slime+datta+ken+manga+pdf+downloadPDF link annotation
    • 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_off0000e725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE725 22100 bytes
SHA-256: 9634579c0639e8ec6339c709eac2cf393dc1b18d27af0d66472def65a043412c
font_01_sfnt_off000121b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B2 11088 bytes
SHA-256: d4f032c30a4914675ed9221a738b248fb61a1ca49c299530f5a2dd0ef18be1d8
font_02_sfnt_off00013b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1