Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e082b2b3c81efe…

MALICIOUS

PDF

88.5 KB Created: 2021-09-18 07:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 94c4cc82d3fe4007891def771c054f16 SHA-1: 03f6d47e8865fc0d2b1357302ccad115e1fd94a4 SHA-256: 48e082b2b3c81efe53e5ce6b008f784b34a868d9b5979070f5ad361fc336da5a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URLs, many pointing to PDF files hosted on disposable domains, suggests a link farm or phishing campaign designed to redirect users to malicious content. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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://synerhu.ru/uplcv?utm_term=world+conqueror+3+mod+apk+super+war PDF link annotation
    • https://pankajplast.com/ckfinder/userfiles/files/dobavukotojovajofapo.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/bikerotebakobasasiw.pdfIn PDF document text
    • https://moolans.com/uploads/files/68972542578.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/75287711826.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/lajupusevizitesafaxale.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/60847105920.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/10723545577.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/xelujatuwuvegimixejan.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/29596572339.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/sogotuxuguw.pdfIn PDF document text
    • https://petikdaun.com/contents/files/nomudabiw.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/lifixaporulirososefanofa.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/wamufidijowatapinabagomiz.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/lilekerafedenituvuronajo.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/94547061736.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/16925998725.pdfIn PDF document text
    • http://posuni.com/userfiles/file/dogasiwovasuxigenugux.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/65420881482.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613190f1a117c---gadidilabuzuxawiposim.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/dogije.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/banopugi.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/telojoxuwosonul.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_off0000f627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 11072 bytes
SHA-256: bb59c12f7fc0240f15ffd6e499bd70e62de03b5df23da46ebbfffa014a52e752
font_01_sfnt_off00010fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E9 18040 bytes
SHA-256: 65bc19638dc99d9a58cb01ffa5df9df444c91d70af8f2ddca687856aaac4e7ea

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