Malicious PDF — malware analysis report

Static analysis result for SHA-256 278b391ca9419d5a…

MALICIOUS

PDF

85.5 KB Created: 2021-09-21 12:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 459aff8f7a31386ee08a226165bab71f SHA-1: 838dba2da812b249e4900a4fc7b64ad4302f5949 SHA-256: 278b391ca9419d5a23102a97fdaeefe06e9e2b8b14975bf07ee810b0f2f424b4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ML classifiers and ClamAV, exhibiting characteristics of an advance-fee scam. It contains numerous links to potentially compromised websites and disposable hosting, suggesting an attempt to redirect users to phishing or malware distribution sites. The document's structure and heuristic firings strongly indicate a lure for financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://matricula.netlandschool.cl/files/petol.pdf
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/63472148310.pdf
    • http://www.jindatunnel.com/up_files/file/32839261998.pdf
    • http://workontext.ru/media/file/31227793295.pdf
    • https://wronba.pl/uploads/wysiwyg/file/58921334544.pdf
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/8368293362.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abf43ad431---pedenulosisuwow.pdf
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/buribogibasazejelezisinup.pdf
    • http://hongsung114.com/files/fckeditor/file/dufenexoxelawenonusi.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161350f6a9d447---17375433038.pdf
    • http://ud2-140.com/files/157191419.pdf
    • http://lawngo.net/fckfiles/40630095265.pdf
    • http://wingmanresearch.com/userfiles/files/89882535240.pdf
    • https://moiatakashta.com/userfiles/file/nafubezaremi.pdf
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/safikikufojigudipaziliri.pdf
    • http://medtravel.lv/images/hand_uploaded/files/65419126143.pdf
    • https://butagallery.com/userfiles/files/tesibijevorupojeferogi.pdf
    • http://gardena.crazyrockinsushi.com/uploads/files/7906902080.pdf
    • http://verynailscm.com/user_img/file/libotadajorobelufubevog.pdf
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/4103329724.pdf
    • http://owv-sad.de/userfiles/files/rukivedowagojexovag.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/582ba4af08eb48bc3abeb44378fdb7a0/14507032480.pdf
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/82412248842.pdf
    • http://igigeothermal.jp/userfiles/file/julofixubilogu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=hitman+1+and+2+in+hitman+3
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3E 16792 bytes
font_01_sfnt_off00010355.bin
9112ce8a311d0cecb5d73af34e244949c330f5eada5cec0b146d7057385bdf3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10355 10280 bytes
font_02_sfnt_off00011a43.bin
265efbfc71a46b4d57542f3f8dd6e64460eeed5e5c41b924b40dd9a1bb89019c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A43 17896 bytes