Malicious PDF — malware analysis report

Static analysis result for SHA-256 21215b7c610a73e0…

MALICIOUS

PDF

70.8 KB Created: 2021-09-18 00:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5b13ee21adf37a83e6c057ba893a6ab SHA-1: 1b4df3e2682b46fb77cf3d2419341ea7921ca556 SHA-256: 21215b7c610a73e0b9cca45308c7863987cda581591208b7e1492a2701b06944
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The document contains numerous embedded URLs, many of which are part of a link farm designed to obscure the ultimate destination. One URL, in particular, uses a 'utm_term=download+gta+vice+city+apk' parameter, suggesting a lure to download a game. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://davnosti.ru/upload/kabemenafixagetawofi.pdf In PDF document text
    • http://michalpavlicek.com/uploaded/file/moxidogonedizofoguresodu.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/xutilibefuvaruzapixite.pdfIn PDF document text
    • http://kleiberit.ru/files/file/43743017934.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/litasefasivalewetuk.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/vufiludapo.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/e06g5r2p36adkhr00bamjqlqle/90177645192.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87441856380.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/75422747583.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/71113061196.pdfIn PDF document text
    • http://scro.ru/pic/file/37623175566.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/17981284597.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/kafuzamajosajizowuboj.pdfIn PDF document text
    • http://gibisch.biz/files/files/bogozoxujum.pdfIn PDF document text
    • http://195exim.com/datas/files/nenusununo.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/rokonosaberepifololoxijar.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/93162600787.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/15045671059.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/repejogosavotevelalatafu.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/39618557975.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16145037f300c4---17546979148.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210910202200.pdfIn PDF document text
    • http://pedraferro.com/files/files/20126495433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=download+gta+vice+city+apkPDF 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_off0000b468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB468 15800 bytes
SHA-256: ca7cb3cdd9471c73a33f6a7f153388ca18d39c011d3248eb2cccd8f88e9af14c
font_01_sfnt_off0000dcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C2 10780 bytes
SHA-256: fd822d2449633d2e3c9f638d267a901410dc47a3064fba3313de9657f60d1a8a

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