Malicious PDF — malware analysis report

Static analysis result for SHA-256 2021338e4a3fe025…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 22:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a49a9c6684b43bbcf51817c97f5560d2 SHA-1: f074ba75c26a5174083c369c0ae375e3d076986f SHA-256: 2021338e4a3fe025a168d582c11093e6c9719e26b47e821d53506a774345f200
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and a heuristic firing for a 'link farm' on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' lure further supports this. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.jindatunnel.com/up_files/file/napizozanolafuwib.pdf In PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/babimaruwov.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/nodijazuxifoxaridum.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/xibedemegisasoto.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/tipumugewekisoxid.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/gavuj.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/74505968994.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210903035231.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/23218872464.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///35867924935.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/4572583797.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/zolarugubekilemal.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/8166375860.pdfIn PDF document text
    • http://m2m2design.com/userfiles/35483297219.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/12264589993.pdfIn PDF document text
    • http://minipit.com/data/files/59172818921.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/26493113708.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/58915790072.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/89306341912.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/lajibakobilutefesosu.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613134c6e5611---5020010216.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/nixagilelunivigen.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/77691033755.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/pumenekujulubatubumimaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=download+carrion+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 10052 bytes
SHA-256: 9f800aafb1b0de573ff2d3ff2fb17868932fa8d38670af98c01e4f259b224559
font_02_sfnt_off000105a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A7 17364 bytes
SHA-256: a1933fcf8bca1e0f7221b22c78a1c6f160564aed43edb6635e86bfa39a48774c