Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd791e1192cf44c…

MALICIOUS

PDF

85.9 KB Created: 2021-09-10 18:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 19d895041a73ccc87da6c40e01207ba6 SHA-1: 90b2076f751600f745b31a0d339a54206d0946cd SHA-256: dbd791e1192cf44c24be7b1d23d4b3e351697c15bba87a19b38205cdc68a794d
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for distributing malware or conducting phishing campaigns. The presence of external URIs and the overall structure strongly suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://ketchas.ru/uplcv?utm_term=add+icon+to+android+app PDF link annotation
    • https://big-affaires.com/img/pics/files/tobese.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/nalibenenowilisumo.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/nakasinam.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/pazigakusuximilofesugime.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/nusosetanudawokox.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/rakivobixowujog.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/radodowijerusezoxigibefe.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/85984389406.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/sekulikuwumowolubumi.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/64225999824.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/dalusalosepi.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/pegvgcp8b8dbh1ish8du1dllt0/86183473943.pdfIn PDF document text
    • http://mastervin.ru/files/file/jetidikibi.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161306df0cd609---60817127433.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/gaduzolaxevekaxofuwob.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210903234815.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/13109514655.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/gaxenimozumuvebaxasasavov.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/24826014945.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/7876784869.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/tivazuligoroliziro.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/zibosijitos.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/kepaninib.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/todesapuwewekepit.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/rupanusijefekuremibenevem.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/popenofemodazelodalagar.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_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 17668 bytes
SHA-256: c27029f5c761c5a44677e9037d24d87d39654f1730147bb69481a52bb138b81e
font_01_sfnt_off00011afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFE 10144 bytes
SHA-256: e2b71027d8a9e432b6493061b8c6c1110ad328c9824c70779445154a27b52998
font_02_sfnt_off000131c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1