Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fca32281e1738c0…

MALICIOUS

PDF

86.5 KB Created: 2021-09-11 05:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4fccabd24db4357a3809691cdbd14942 SHA-1: 17ff320e3eccb803f0b47c7af94ecc815d4e9490 SHA-256: 8fca32281e1738c0f3ed5098696619e476105ea2b312ef08a229180d561cfa8d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, suggesting an attempt to direct users to potentially malicious sites. The presence of multiple distinct hosts and a high number of links per host further supports this.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c6a2b85fb97c18e2862079dc31e16f8c/boverizifow.pdf In PDF document text
    • http://nowyhotelik.pl/userfiles/file/30369091994.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/zubezojokijiwome.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/fuzojunexaw.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/g362pr9fqd8cjiktpj8ocasd0k/dapelaleneduboxidawirun.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/wububosorekibin.pdfIn PDF document text
    • http://bresky.cz/res/file/54480085085.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/vegerobexiwazijagezulekux.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/83516423279.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210903120443.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/furavizokenedugalo.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/69388350483.pdfIn PDF document text
    • https://fishuntpesca.it/file/39604403091.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/26783636069.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/31744043110.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/47567533577.pdfIn PDF document text
    • http://salespate.com/userfiles/file/sebidemitof.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/timulepafunuzedakazofu.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/kigogedalulonubaxebegos.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/lebinavifi.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/69048511471.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/daduv.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/getafaribonizudixig.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/55463497991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=network+booster+app+for+androidPDF 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_off0000ed0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0A 17708 bytes
SHA-256: 98cd221e444c099c8a9c05a2e219146fc4f9eba09a882a09e8c800c5be65dc3b
font_01_sfnt_off00011b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13352 10740 bytes
SHA-256: 84247e0cb947095682207b5c2159d9ab6f2ff9ca1e36c241092fc82fa63988b0

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