Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b61d18309c224d…

MALICIOUS

PDF

74.8 KB Created: 2021-09-13 12:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9f2dd29a759396db4d1bb490d5fd0bb9 SHA-1: 4bb278297c27c79108be645530d02152fdcdbb87 SHA-256: 04b61d18309c224dfac531e438ff3074cf7bb2d2b4751a5c84337d014ba23d6e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links pointing to various domains, many of which are identified as part of a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests a malicious intent, likely for phishing or distributing further malware. The ML classifier and ClamAV detection further corroborate the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nadiadsa.org/userfiles/file/59796312273.pdf In PDF document text
    • https://xo-sound.ru/userfiles/file/gelorud.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/donewikusumale.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/vufixepilumulemakejel.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/56471942992.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/10064804916.pdfIn PDF document text
    • https://onecre.com/images/content/files/rugarotekuwijulafozo.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/28005296924.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/wederolafuwisuram.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/2b6f7402008d50a4ebf948916891e128/5478137693.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/vakanuxoviragu.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/vigodajidukimagujitezamem.pdfIn PDF document text
    • http://onelove.cz/file/53717003470.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/gebazujukirif.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/jotazimufejubugewimuxi.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210912062814.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/bujosimutojanizukuval.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/59589294800.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/41695347.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11274371365.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161328a53c02fd---55836006420.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210912071806849126.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/lokanuxewomusomazifom.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/35795173046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=script+php+print+pdfPDF 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_off0000c406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC18 16568 bytes
SHA-256: 25f7bcb2b4694bf25a70601df5904aa042f683f6d462fa74ef165f94ed812d5c
font_02_sfnt_off000106ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EA 10164 bytes
SHA-256: 5247d32443d83cf5de2125bec949dcc8a5246e4d6763ab51032d94ecf4093fee

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