Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ae1499e0542cc2…

MALICIOUS

PDF

73.2 KB Created: 2021-09-17 10:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c30f52c4169d2a52bd93819d5329b780 SHA-1: fbbf677af64da8756733a201e80d14a2fc832510 SHA-256: a8ae1499e0542cc213c8ca4234a0089cacf5e4a13ee5cc48a15bea7d058efd64
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The presence of external URIs suggests an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://blankheich.de/images/uploads/file/dubaxukiwurukote.pdf In PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e2fcf7187aa54ad64ddc031114ead1a8/sanano.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/viduwasegeketijazikusulus.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/81078089930.pdfIn PDF document text
    • https://rosycaffe.com/file/48509674085.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/kefaxesin.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/mipegajuvidevitu.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/dojoferuxopapepo.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/nugeb.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/fowatadudoduxidokox.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/26882383629.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210907_33AD2E6E7946240E.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/verumopejosexew.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/32756613722.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/datusexojovagarofaf.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/xevipemogipelulisuv.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/62679930307.pdfIn PDF document text
    • http://4darchitecture.org/img/all/75389684847.pdfIn PDF document text
    • http://esistore.be/userfiles/file/3192415831.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0d9495cc1---4877946116.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/66595064020.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/12883857943.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/5803037019.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/88037123197.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/kipezatejupudafogiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=series+apps+for+androidPDF 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_off0000bd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD10 16636 bytes
SHA-256: dccc9883e0c8e7151cea55b6c54aa5ec53580e8652c9fc72c7645517e0808d4c
font_01_sfnt_off0000e7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 10420 bytes
SHA-256: 8043b6358601d229f6466e11075d136ad8364de1f3b21cf31ba62fb20df83f16
font_02_sfnt_off0000ff50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1