Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4860160d24ea1dd…

MALICIOUS

PDF

74.4 KB Created: 2021-09-23 01:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 08aa04dde03d5a1b80e21f1d10cb9c88 SHA-1: ea9212a0d89709bb8879a123914757ad9338e46a SHA-256: d4860160d24ea1dd0a04b5e47533591d6ba6fecad6da779b9ff7f252e7553d1c
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614082396e251---86648578156.pdf In PDF document text
    • http://jinsonmetal.com/Upload/file/kafigowajazula.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/62034165906.pdfIn PDF document text
    • http://ty-int.com/files/files/3459944095.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/58084673038.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/89182034618.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/fosurizoroviv.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/posugexigotetofu.pdfIn PDF document text
    • http://gapp.fr/medias/files/dozupirikuvimopali.pdfIn PDF document text
    • https://mklaassen.nl/images/file/jugosatuliv.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/36214826447.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/90958756934.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/59334762661.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/10500840137.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/48685305598.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba66fc00d8---zanapega.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31724247495.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/naweruw.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/13206420187.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/juvujotojeju.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/24963361527.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/59460284412.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/sokumelemimatevazedex.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/wanugoninuguridog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+giver+chapter+6+pdfPDF 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_off0000c285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC285 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA97 16100 bytes
SHA-256: b23e1ae647d2165c942183e46b13a8c33cace615b2f0db5bc7c8324acd7713cf
font_02_sfnt_off000103ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AB 10660 bytes
SHA-256: c0d329dd22c22db3ed5e093c6c83683026029b7657046161841a6e5c2aa9bb31