Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e7545b4aec1538…

MALICIOUS

PDF

81.2 KB Created: 2021-09-22 23:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 764c85f12375ca332214e957bfb6df21 SHA-1: 36fe6dad8e3fff111d8df187a02cfe1acc6ed400 SHA-256: b5e7545b4aec15389f74768342a46a6786519cd9d78cb6955fcf844b338a18e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, one of which is presented with a 'free fire 100mb download' lure, suggesting a phishing or scam attempt. The document's structure and the presence of many external links indicate it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://piotrkowska77.pl/zdjeciafile/32785068006.pdf In PDF document text
    • https://indiachristian.org/uploads/files/ganameleteluwupimewibe.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16134ed018eb06---24859581179.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/20651733438.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/13007483403.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/39573529188.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/vedinokome.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/xelikut.pdfIn PDF document text
    • http://atek-ent.com/upload/file/13127473715.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/87626772463.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/17905613123.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/13520347003.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/sirixosedezuranib.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/jetiwusogibe.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/74295750874.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/27095167488.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210918_201045.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/33638871797.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/nazegugak.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/74784189880.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/dozilanapu.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/40686725374.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/sidepuz.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/29142976822.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/13908651443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=free+fire+100mb+download+2021PDF 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_off0000d9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 10748 bytes
SHA-256: 34b616cee589a0333b32c9b6b1e67a0da68ca5db8398e254652a0852cf112ac2
font_02_sfnt_off00010aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA2 17220 bytes
SHA-256: 3e2fb0c3356033eb095bcee42bd93f0cff27b7751ca5ee798f36f188309fd2e1

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