Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f342f93b30d9cf…

MALICIOUS

PDF

73.7 KB Created: 2021-09-12 01:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0139c3ea107a013835be76b5002f9208 SHA-1: 48f4286ad4a62d42007072920f8de9be33890433 SHA-256: 77f342f93b30d9cf854cd6c82cd5abcf03e3458f69ed2b41748cbab8a642e45d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and ML classifiers as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting an attempt to redirect users to malicious sites for credential harvesting or further payload delivery. The presence of external URIs and link farm characteristics indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nomylo.ru/uplcv?utm_term=unlocking+android+device+manager PDF link annotation
    • https://pakianco.ir/data/image/uploads/news/files/68103723866.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/718790374.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/lumeladiv.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/db6a2f674be0bdbf20a52568d26899f9/42760095288.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/96727926457.pdfIn PDF document text
    • http://mebco.ru/images/file/9386348781.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/41905122180.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/79585310577.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/35758037502.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/lazepevigagapef.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/74120441676.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/fuzob.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/67665001167.pdfIn PDF document text
    • http://gulfapex.com/uploads/file/jobotimafino.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/58594467057.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/22319567274.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/veduxalodeboborojonanub.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/81403759102.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/65913197895.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/68367202278.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/xexawedotutadu.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/doxukarijusazebizafak.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/wizofetisebo.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/1584564090.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/pozekanoxokazazazusetep.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_off0000be60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 10612 bytes
SHA-256: 34f09514b6ccfbb22e330f33dd3908cdb016d3e998e135604af850abb858be9c
font_02_sfnt_off0000ee73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE73 16780 bytes
SHA-256: 6f405119cf9600e4c0e2ae8af84393ebeec7dc409ae05cf6b1cc7a0b288e10ff

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