Malicious PDF — malware analysis report

Static analysis result for SHA-256 321fbe9c814078ce…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 04:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dc3acf64fa3fbf0d31731110be8bc039 SHA-1: d225e1facc87b0a90e46abf7c9668b4cc850e55a SHA-256: 321fbe9c814078ceda7bc8436eec8bdefbd577396aad13a3a8e964d430138f00
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick users into believing they need a password to access content, likely to bypass security scanning. Numerous external URLs are embedded, pointing to other PDF files, suggesting a multi-stage download or redirection chain. No scripts were extracted, but the PDF structure itself contains embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://queure.ru/uplcv?utm_term=how+do+i+turn+off+safe+mode+on+an+android+phone PDF link annotation
    • https://afritransport.com/app/webroot/files/file/nosoburizakadi.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/rowab.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/94501863692.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/sujabagaxesijujuvul.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/xegasuwabugewibevaferuxu.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/loxonosep.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/megiteleg.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/josififitosoxulezum.pdfIn PDF document text
    • http://adveotec.com/img/file/80074726672.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/28857929239.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/xizibenuwutilewadabuza.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/lebupukajijedes.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/toxim.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/64353420987.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133eded8d466---21762332539.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-10/20210910191305610842.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/kapewigofa.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/powuxevigikizizetewale.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/59997010153.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/77487273826.pdfIn PDF document text
    • http://ijfbn.com/editor_up/76295667773.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_off0000d5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BA 17844 bytes
SHA-256: c66cbbcff9fce8dc0e3fc3733324ac7d281de6ff42dcca87d9395a4c29ac0a2c
font_01_sfnt_off000103b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCD 10896 bytes
SHA-256: 28201ef040eabfd275084f27f239f3db60a88d8f9ee213e8ca33d8db955850f3

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