Malicious PDF — malware analysis report

Static analysis result for SHA-256 1823cd2dc73e687e…

MALICIOUS

PDF

78.3 KB Created: 2021-09-13 13:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 87cd2a6455e56545d270cc5d89d39cf8 SHA-1: 8ec50c76a32176d213e01b4d96c840b7ebdad0bf SHA-256: 1823cd2dc73e687ef875d55c3e8739558b9c7f61f7aeadc05d10955af116464e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it's designed to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cructi.ru/uplcv?utm_term=mlbb+s18+skin PDF link annotation
    • http://www.electricman.in/demo/frontend/web/uploads/files/76035670229.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/zoledo.pdfIn PDF document text
    • https://gilbertems.com/videos/file/jeligagu.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/gutux.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/195b96d8024a368affd79e7c678c6707/nuzuj.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/57400884950.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/70457882686.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/larotojotozurenumuwo.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7b12a4e330be3bf9cc8c02b0d18d2c07/45192799293.pdfIn PDF document text
    • http://citty.org/images/uploads/file/88256980735.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/59831573233.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/56064660374.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/67399844540.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/1218339681.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/razawoxosuj.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/69472999102.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/59855631533.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210912190518.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/48447494191.pdfIn PDF document text
    • http://progetec.org/userfiles/files/basoburosi.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/jivugobagokisotewenawun.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/wamopil.pdfIn PDF document text
    • https://digireg.ru/upload/pupujofibisikozigoxidok.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_off0000cc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6B 9972 bytes
SHA-256: 5624b2a408a97849f950aced897a5a7e2fe98e2283e26e5b2e62c2729ab70c06
font_01_sfnt_off0000e28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28C 18444 bytes
SHA-256: 311166fecd9ac2b03a77738e3965c5dabb73f7e8bc32ba72ac5551cf7c951d29
font_02_sfnt_off0001135d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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