Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae6932ccac4b1d15…

MALICIOUS

PDF

84.7 KB Created: 2021-09-14 06:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eb37c3dbb6eaa56b2ecae8765d8f6447 SHA-1: d19fbbfc990ab62a486cf3f8f4e4ac89d1940094 SHA-256: ae6932ccac4b1d1586332afdfaf349ddadbe88e78c19689382bc1348cd97bf4b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, likely involving obfuscated JavaScript or other embedded exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://altaitur.com/ckfinder/userfiles/files/tosibebufuwilep.pdf In PDF document text
    • http://adhdesign.de/userContent/files/20210908185704-weliwirezilofitosenogasef.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/todirosefopivamexo.pdfIn PDF document text
    • http://kesifveotesi.com/files/sexuzowawulizululigovo.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/33552621781.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/werelu.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/tilodudagerekumu.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/31229286924.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/soriwab.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/bebudefekudaxufal.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/e6d2c4e02272de051d0a26fb2abb9ad1/vipebesekisutipamedasonab.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/jaloxisalepilugodav.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/94390241343.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a9435be2---jedirawibozemudex.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/80802053284.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/gemilujosasizaxor.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/59013507465.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/pazezemuke.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/raluwukedovepigobapotas.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/rujinasevazalora.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/dufelibosibajoxisetejibi.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/nitulojum.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/febejipesofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=9+android+settings+you+need+to+turn+offPDF 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_off0000e43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43B 10768 bytes
SHA-256: 1802a92880366431c02210bc57708410ceb641dc8f1493d0d833d0009f6cb594
font_01_sfnt_off0000fcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 18484 bytes
SHA-256: 6e8737935281409b4bde6f77c1ddb1334c203eefaffe428010f5a093af056b5d
font_02_sfnt_off00012d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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