Malicious PDF — malware analysis report

Static analysis result for SHA-256 4510cdd2c2308e37…

MALICIOUS

PDF

68.6 KB Created: 2021-09-25 03:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0649200ebe067f780237b9fa9469e800 SHA-1: f8e5281185bb487d0cc3f0ff52d6bec4b7a88821 SHA-256: 4510cdd2c2308e37f7eb32bf9c0153653b6f304b0e19f760375da2c3d5dd39a3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and the presence of numerous external links, many hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://irlanc.ru/uplcv?utm_term=inspirational+words+starting+with+v PDF link annotation
    • https://promise-land.com/upload/file/27260934846.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/6966469778.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/wikifozi.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/debudemowojupatezejaxa.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613028cee83a8---71568307198.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/pitixopuxupodali.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/zonuzarowikexudinebomel.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/rifogolixewaritonojareras.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/8504233842.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/xoxavowonorafizuroned.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/bogipes.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/90622757462.pdfIn PDF document text
    • https://upaspor.com/resimler/files/wotidero.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/nikikujam.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/lizudifaxovelixolu.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/nogatifi.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/rinagodosovapuvi.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/wuzifuzabef.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109241844553193.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090417500242.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/mebejevika.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/83246610831.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/161451bda421d4---19289046834.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_off0000b124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB124 10640 bytes
SHA-256: edc521f42094a85d9126290dd38448e404c1f9416c5bd87e2c2391b172447ae1
font_01_sfnt_off0000c935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC935 14224 bytes
SHA-256: 6c4d3517389959534c3ad13e52088fcf603b2001e467d17c722823a2dcd76700
font_02_sfnt_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1