Malicious PDF — malware analysis report

Static analysis result for SHA-256 2723e7deae9486d4…

MALICIOUS

PDF

74.8 KB Created: 2021-09-16 13:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 71ba6c0d74c93d78228679177cdbf2da SHA-1: 3dd7f941cc020525f5c2e335d73c64b79032e20d SHA-256: 2723e7deae9486d456845922ef50f4e4ac17962e5fd2c5364a42f00a6ff7b56f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=surf+vpn+pro+apk PDF link annotation
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2e5ca0794---kolubimowobukugoxudis.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/rizuxivisugapafuw.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/5744129582.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/tonalozuvuvevitukulolenam.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/fazafixixagojodopibuka.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/mupamuvozaja.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/pepokasomomolaxam.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/34498452186.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/wakogobujixazil.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613666a52597b---38463634095.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/sajekaveg.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/16779848459.pdfIn PDF document text
    • https://maymac.info/userfiles/file/50102052620.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/83266624749.pdfIn PDF document text
    • http://acelybio.com/upload/files/lazozavugosawoledepokamo.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/28191846430.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/82537711924.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/davaruwitozisezozobumebe.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/gudoxepabixa.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/fepemax.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/tigiwaxajuwabonadoz.pdfIn PDF document text
    • http://oodow.cn/upload/file/210916055445553900ahpw46rf2xyf.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/93511080530.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/tuzusuxi.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/nidamavano.pdfIn PDF document text
    • 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_off0000bcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCEE 19108 bytes
SHA-256: f181721a2256602c002577695edae9e388c12f65a074a821678eaf3003e80423
font_01_sfnt_off0000ee59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 10148 bytes
SHA-256: d57ee4ecc726bba1036e5fd55ed8758ecc0ee1fdaa54165f5f47abf33deded26
font_02_sfnt_off00010534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1