Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22e353a318bbc27…

MALICIOUS

PDF

101.6 KB Created: 2021-09-11 09:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 89f9703b19f8fcf69ca1e90795b244f1 SHA-1: 2580d52d1893a999afa2438c930798ba233c75a1 SHA-256: f22e353a318bbc275d1d6b137c6215b0251fd2e863b5a3425119f3cd62d8c839
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The document's content, though heavily obfuscated, likely serves as a lure to redirect users to numerous external URLs, many hosted on potentially disposable domains. The embedded JavaScript is likely responsible for initiating these redirects or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://fantalife.nl/userfiles/file/vidokujunugo.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9709f39ed---13674536365.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/60200754839.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090920264313.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/rekanatogejezewenisoji.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/86027750833.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/tapejan.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/67981619586.pdfIn PDF document text
    • http://chromoink.com/updates/file/kewabogiviguriruvu.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/70669987258.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/lubonumik.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/10576040057.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/5335108328.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/vudonij.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/sinadavekewakari.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/kewidogexun.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/52065619927.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/4212075252.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/vawawepuwepuze.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/50643482866.pdfIn PDF document text
    • https://olterus.info/contents/files/zuziges.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf452e796f---78028017980.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/rosedudepin.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/fegazaberoxeximedakag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=best+mahjong+for+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C40 18176 bytes
SHA-256: f9d6ae7f05bcfead92d517be1c8446aebaab40e7cc6c51f9d533763f57a5df6b
font_01_sfnt_off0001293f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293F 17596 bytes
SHA-256: ed4b321c39028dcaf56a911a84238ad5cda8760d805043f25896aa0d09b9365f
font_02_sfnt_off00015702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F19 10936 bytes
SHA-256: b5947742e2f26b76d9d62e9ae3b678d20a19de880abc976da6803540d0a15a92