Malicious PDF — malware analysis report

Static analysis result for SHA-256 deeb99f77e406d5d…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 16:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9fba0d62e8cbfe8af021501db16c8118 SHA-1: 31e3ced0777fcf96bda5307202e4b87af734afc3 SHA-256: deeb99f77e406d5d6d92ca09dab39f042d584b7b5bc7bc4874a2104ea6ca9716
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of embedded URLs suggest the document is designed to redirect users to potentially harmful websites. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely delivered via spearphishing.

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://irlanc.ru/uplcv?utm_term=how+to+connect+phone+wifi PDF link annotation
    • https://vibangthuaphatlai.net/uploads/files/30800308180.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/wamesixowulenaxo.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/4ebqa5rid7tcmh8o4gr53vos51/wikazarazitidopukipa.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/71442080027.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/79411344285.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/68837710724.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/7535262927.pdfIn PDF document text
    • https://mangallagn.com/images/file/punomuxisizejaruwetosi.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/29896791607.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/41023243617.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/52092442269.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/kanoj.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/vowol.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/luraxukezanukovujukigo.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/54850901651.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/81554853625.pdfIn PDF document text
    • http://popmetre.com/news/files/gusagenowofatujeriweler.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/xenaxilube.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210913023113.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/11767324734.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/ranedomamigil.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/67454645799.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/79761748310.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/bimomixibaxepujefa.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/2862896182.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_off0000b049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC860 10176 bytes
SHA-256: 1cd6870616927ccb379f88b283867bfae5a7a5f5d59a7a4640934228f0fceff1
font_02_sfnt_off0000df13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF13 15920 bytes
SHA-256: 9f786447f883a432dd208596b9f94cf8cd2bec60f8691949550a2fa745449da1