Malicious PDF — malware analysis report

Static analysis result for SHA-256 5581fa077ddb74c5…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 12:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 1edfb6c7b7ba8bdd4b5cc6762ec10578 SHA-1: fffc11532f1cf3d8e6437225ad6b255a382007c6 SHA-256: 5581fa077ddb74c55b9e7cc4019820952ff2877489528b7cc7ef549bb4fc1db7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable domains, characteristic of a link farm designed to host malicious content or facilitate phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is the intended functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://phanmemerp.vn/attachment/files/65310117181.pdf In PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/44725977741.pdfIn PDF document text
    • http://unseretochter.com/images/file/44597286501.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/tufosogewugiwafaj.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/30588719497.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/62784166884.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/dakuzadunirutadevadawu.pdfIn PDF document text
    • http://air-ned.com/uploads/files/mefurokogewuzitisexatat.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3a40cdca3---27794285324.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/gediwadisitoranuzenu.pdfIn PDF document text
    • http://mega.kz/media/upload/files/13183088968.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/eb1147cd83d63115b6f954c5c06016d5/pubipuki.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/13122531720.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/19018067286.pdfIn PDF document text
    • http://a-pluset.com/userfiles/68233123928.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/lesisivomipamilinunaxef.pdfIn PDF document text
    • https://viceda.com/userfiles/file/zuteserimomuzopokuzinitu.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/97261199944.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/vuzeg.pdfIn PDF document text
    • https://nevisnews.com/userfiles/domovi.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/78041310951.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/jinafed.pdfIn PDF document text
    • http://lagrupacio.cat/file/70869860978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=android+db+meterPDF 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_off0000db73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF385 18908 bytes
SHA-256: 4c8896613a8269828fd5b23e40130dda07b81ee800dfda94b3445d3c33736979
font_02_sfnt_off0001251d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251D 10156 bytes
SHA-256: 6d29c303ae164ba5e04adeec9e2db6e0e3efb9dbb9a2e2bd660c8165f8fe8b72

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