Malicious PDF — malware analysis report

Static analysis result for SHA-256 98acb1b109f5a4d4…

MALICIOUS

PDF

88.6 KB Created: 2021-09-20 22:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ce9d48984cfb456f96eef356ba6142c8 SHA-1: 5f18222438f9ca3b082252875850c02c5f7e1515 SHA-256: 98acb1b109f5a4d49990d924368693f3688a8cd65753c624a115188cbb4b48b0
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting, with numerous distinct hosts and links. The embedded URLs point to various domains, many of which are unknown or potentially malicious, suggesting an attempt to redirect users to phishing or malware-hosting sites.

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://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb2c15d94b---26257156019.pdf In PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614178612d47b---nekubanuvari.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/bepulefesa.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/rajivexizuzonuputiw.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/jipizekewogiripidufefaji.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/36869663375.pdfIn PDF document text
    • https://polytex.de/sites/default/files/70979823684.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/gabines.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/woduloxagenotu.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/41501438457.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76401250024.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210920171032.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/75062533925.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/53963472036.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/xowigivule.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/kikubopaxes.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/tonobupimavelezisudolu.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/vajenebobebelozinawopo.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/texisanuwikizofar.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631329986.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/21964830758.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/logawazebumuvusulemibedaf.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/30153382462.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/nawaz.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/85991624297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=waves+in+order+of+increasing+wavelengthPDF 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_off0000f2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 18768 bytes
SHA-256: 92e988bc9245398360557c8bbbbd5dc183095fa5215532c84445b5f0dfdc5cdc
font_01_sfnt_off00012399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB0 10900 bytes
SHA-256: 30d376ec13eae3319a77f0d938d42451dead009c98fef309af39916e2f972c04