Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28b41b837dec109…

MALICIOUS

PDF

71.5 KB Created: 2021-09-23 22:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fee581be310ce6ebe43c91031c4bdae2 SHA-1: 48467a336dc5d354ceda586b42524ad249b17321 SHA-256: f28b41b837dec109cf6283806971250600406ad4f54c5cdd9159f75cec3b7796
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as malicious by ML classifiers and ClamAV. It also functions as a link farm, directing users to numerous external PDF files hosted on various domains, suggesting a phishing or malware distribution campaign. The presence of embedded JavaScript indicates an attempt to execute malicious code within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dakeworurizirunomilazaj.pdf In PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/29167692719.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/nanes.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/68164270890.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/womadekevuvazoguxaj.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/74458055727.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/71680941768.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/29438053096.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/pakojezijatonegogigebu.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/dabigotub.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/2477617801.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/45610717325.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/fifusut.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/sq1581r4gh1j93eie5bvviof5c/30697062608.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/11879645657.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/sidufe.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/fobizer.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/67914307499.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/7748728307.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/22047012238.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/73021574049.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/625613242613e59a187239.pdfIn PDF document text
    • https://esz.jp/img/editor/files/jevagopujo.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/78726227084.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/kudumenatuvatubanovorenoz.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/145358663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=see+tv+series+torrentPDF 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_off0000b8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FC 10032 bytes
SHA-256: a9fec970e6058c352e725ad66998de9b53131ed09f20912eaa7f6c3159b2622a
font_01_sfnt_off0000cf68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF68 16004 bytes
SHA-256: b9c1c3898592ed01f9cbed059e4a36dc4dc626e2729c27e9733742777b3e7f78
font_02_sfnt_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1