Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f42349968bf4f5e…

MALICIOUS

PDF

82.9 KB Created: 2021-09-14 10:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e861140ae8fe8c5dce7234f4a54d50fd SHA-1: 8e2db1e6c81948b3e3a9cbc7c11b97efd972e616 SHA-256: 2f42349968bf4f5e5c4c22d5845879c0fc24766b27062c690faaf0ace46638a5
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and multiple external links, many of which are hosted on disposable domains, indicating a phishing or malware distribution attempt. The presence of heuristics like 'SE_PASSWORD_ARCHIVE_LURE' and 'SE_DOWNLOAD_BUTTON' suggests a social engineering tactic to trick users into downloading further malicious content, potentially disguised as a password-protected archive. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=wwe+smackdown+vs+raw+2008+apk PDF link annotation
    • http://rhondachem.com/d/files/43030162466.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/fopikanejigidikegu.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/dowagavepisejetobonejib.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/34243702186.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210908_5EC5C46E55F04132.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/79189169918.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210903_DF15D4F7B211263E.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/gamiponulewokugivuwepim.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/91713266246.pdfIn PDF document text
    • https://mkontroll.hu/File/zetipibugu.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/80540183295.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/71924895858.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/64116436603.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/vinerilid.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/45776709118.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/xoruwal.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/gidemozavubelamelixodafi.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/7707429237.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/65814296566.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/golidozejopile.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161381cc0bebca---xubizebazibawomisowugemo.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/46993879712.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/90050605347.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/mevotijofosarolifikinexo.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_off0000da8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8C 11124 bytes
SHA-256: b2d9a256abe975276e300645e5e38f4a61d656f1810f02fca1b9f23b76ed9167
font_01_sfnt_off0000f493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF493 18916 bytes
SHA-256: cc8b1740f7faffb382e83e659f7e38337b64f7e15a403ebfc67f3019035a937b
font_02_sfnt_off000125e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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