Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e8d0fdc7aac611…

MALICIOUS

PDF

84.8 KB Created: 2021-09-17 23:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 35565d16bc2542dbbb7abdfcba7a959d SHA-1: f8ebff8941a71c0a60f208ba2cc5a2d5ebd43e19 SHA-256: 90e8d0fdc7aac611026516d9344df1d222836bcfa0406ed52acc2eacbb6e7390
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. The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to be part of a link farm designed to redirect users. The presence of a 'download button' heuristic further supports the phishing or malicious download lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://a-pointpro.com/cms/ckfinder/userfiles/files/18625039029.pdf In PDF document text
    • http://narnivet.com/userfiles/files/90632813093.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/96553940071.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/povalisugumoparukagan.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/80432954748.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/zirevaritebozemarun.pdfIn PDF document text
    • https://synersys.fr/contenu/file/tenokujurejutovidavola.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/68146676423.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/noxuxutozijef.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/laluxagedeti.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6152df77d---vivisotoj.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/47668504783.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/weweluzifitenaxokap.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9357238be---40009381729.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/jinesegerujerivitokoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=whatsapp+plus+version+9.00+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_off0000e3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD3 11088 bytes
SHA-256: f73a09a83885fc2e748c7feea787fa01f5a72bc075346213d237f8548a036079
font_02_sfnt_off000115a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A7 17868 bytes
SHA-256: a822d32b6b16c63e198ccefdeb0ad120b853b39e9de119a88d72171e49c9b3a8

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