Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e6ab7d63977c68…

MALICIOUS

PDF

92.9 KB Created: 2021-09-18 20:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d7450d19bc4a20dea9927f47087857eb SHA-1: 64b995be5d87612aee8bc3b54e6505f3613e273e SHA-256: 87e6ab7d63977c6873a895c01064c5ddd175382f537b3c3eea306e4891b743dc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified external URIs and a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this, aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=samsung+s9+plus+firmware PDF link annotation
    • http://inter-travel.hu/_user/file/18980943305.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/89139933309.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/mobunamosesini.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/62028150611.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/88216761787.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/56421517755.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/wosek.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/1964344763613630c410d43.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/jilewulobovoduvon.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/2294228326.pdfIn PDF document text
    • http://faradbox.pl/files/file/55625430288.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/740228912.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/56438187551.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/rapoxifunono.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/wexodajufokif.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/ruzekaxuzug.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109180942585836.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/48447494191.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142f1c3a5296---80164959403.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/bimuvuri.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/futisaxijovot.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/6148051033.pdfIn PDF document text
    • http://creationart.hu/files/file/64867815808.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210905123614.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/xirewowuzafet.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kotuxokuwuvujiketilo.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_off0001037e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037E 10912 bytes
SHA-256: 9d36de10acf994fb89f2c1bbfd3d0b7d997e8b1c5be57c850c15cf8cee3137a8
font_01_sfnt_off00011cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D0 18528 bytes
SHA-256: af020020aa46babaa8845f38294a642be04b694e97c520809a1ad8a6e3e8887a