Malicious PDF — malware analysis report

Static analysis result for SHA-256 6debac5973a33017…

MALICIOUS

PDF

83.5 KB Created: 2021-09-16 10:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7281067ab62b57d3698bd4b1537633ef SHA-1: f8f3f73121c4f9b19d4cf7f396ea370f82e1f967 SHA-256: 6debac5973a330178aed6a440ac359e9def2f914e5202e2a3323752e5a2926db
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of embedded JavaScript and numerous external URIs, many pointing to link farms, suggests an attempt to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://jl-vacuum.com/upload/files/mufejanugapar.pdf In PDF document text
    • http://packturf.fr/files/kalinubovozoxijilopenijuw.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/11654525427.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/fanuwikevezufasuvote.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/tesawagagodiri.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/70795717270.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/vigevetetugubenuwin.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/31968430324.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/19133024343.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/11749186422.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/gobofabeseramogavifawix.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/nadej.pdfIn PDF document text
    • http://apismorava.eu/docs/jijoxir.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/74108813222.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9bfc1b258---33609830842.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/92782552171.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/0c959663c799aa7eeaeff6514dd92535/wigasusobabuzikimevo.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/36692435701.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/18244827728.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210916020958.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/42903979729.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/46579906290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=blacklist+android+appPDF link annotation
    • 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_off0000e2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E9 17480 bytes
SHA-256: 1c58cd467cc1298e851aec5d199ec4ec15d5f5fa82ed0bfb911844c4f3c116c0
font_01_sfnt_off0001101e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12835 10520 bytes
SHA-256: f13cb574f73db0998103d5d0c3f6cccf2ce54a303b512b204500d1f93f602a4c

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