Malicious PDF — malware analysis report

Static analysis result for SHA-256 414c995e5a709613…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 16:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0135da9a07af570dd21cba2c1d5bd8b7 SHA-1: 85b821b6de843d4ba41ff01dfd325f43c598fba5 SHA-256: 414c995e5a70961324083a4742c396e2e2ac885eebb6bc68edc8c84122ac148f
174 Risk Score

Malware Insights

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

This PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of a link farm, directing users to multiple external URLs hosted on disposable domains. The embedded JavaScript stream and the presence of numerous URLs suggest an attempt to redirect users to malicious content or download further payloads. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • 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.
  • 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.
  • 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=jar+app+android PDF link annotation
    • http://autosklo.sk/pictures/file/vunitiremorenusoj.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/gagekixuzededup.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/18666815335.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/d62hhfh3mo3lml26moi11qcauc/vamoz.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/xokavefewomigiru.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/4226787804.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/fobijununewuxugawebovixu.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/kexaxevexanatezilukilebov.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/64sprde35r8vvnvtm1eodii451/ravasetulizaxifefiwona.pdfIn PDF document text
    • https://karate2.cdmedia.pl/userfiles/file/93208256842.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/93851795209.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/nogodipamugad.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/jumabakegufezi.pdfIn PDF document text
    • https://limadelimon.com/images/file/bowenodadisofaxege.pdfIn PDF document text
    • http://vinamex.info/uploads/news_file/jexakokiraju.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/18169682397.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/61823684455.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mobanonusitex.pdfIn PDF document text
    • http://svx.su/ffile/file/25730951772.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/lizivosavanud.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/1543389146.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/45967318964.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/tisanozajenipuze.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/pukewovuluwasidado.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/41044050522.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/teruberiligew.pdfIn PDF document text
    • https://mkart.it/uploads/file/regovulupupumov.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_off0000b633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE49 9932 bytes
SHA-256: 04e80459387ce44e47057103490b1ff93dcec3a9e08b5a444256ebc461d7982f
font_02_sfnt_off0000e42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42E 15320 bytes
SHA-256: ef40b0871ee96a68c5370a16735ea20e3d8aa6a0d178fc9946f1399dd57495fd

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