Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f8184488b56ecd…

MALICIOUS

PDF

68.3 KB Created: 2021-10-03 01:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9d694fa5d8b5f95ae6012b47cd1a4afc SHA-1: 5173bb32903ec344ed4936e54387b8af33a60ad5 SHA-256: 90f8184488b56ecd4dc9bc2001117b2c39065df1f9694ffa3a588fe2dc3b0bb3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an image-only facade with a clickable action, typical of attempts to redirect users to malicious websites. The presence of numerous external URIs, many pointing to disposable domains, further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://allprintusa.com/admin/images/file/zosemu.pdf In PDF document text
    • https://radio-clipa.ro/userfiles/file/xawakelemeta.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/77326902820.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/nageverakod.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/jaxora.pdfIn PDF document text
    • http://rsentco.com/upload/file/44017536980.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/durig.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/kurijakowa.pdfIn PDF document text
    • https://tempegaring.com/contents/files/31987417608.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/tibululusife.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/gigutuzoxuminafivebezu.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///94421311112.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/vedesebibexaleja.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/7346757629f110b7922a0ad71f9eed49/zawobutoza.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/sivute.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210913064359.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/66608818406.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/38860510930.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/falimudusodogebepekoko.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/31977312670.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/banazodenuma.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/nupumijobotife.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/bejetinivam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=compact+round+robin+betPDF 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_off0000af3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3C 14552 bytes
SHA-256: 68bc08ebd4fb7b0f1afa932e7d1e122bb71d1670cd4b9703345339689f9aaf01
font_01_sfnt_off0000d33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB56 10732 bytes
SHA-256: b3d74c5e18e4e3b97941873af5c6fe11dfc710c05f5395951df588399445ac8a

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