Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b2ebb2661e1931…

MALICIOUS

PDF

77.5 KB Created: 2021-09-26 03:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b784b640f500fce2933115de39086c7 SHA-1: 45d9dd8c0523f4efae3d3088724e43e393c1d510 SHA-256: a2b2ebb2661e1931fce5cf9f919192dc69089f31b7ce497b52712d085ed7f01f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded links, many pointing to disposable domains, which is characteristic of phishing or malware distribution schemes. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16140ef16188c4---19524504258.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/9as6ugd7pbcbno62oosh5pmka5/biniforagatepasudodekenu.pdf
    • http://nc-israel.ru/upload/files/pukifumidusezajaboju.pdf
    • https://ihotel2b.com/upfiles/editor/files/tudetimukokam.pdf
    • https://tennis-samara.ru/img/file/41607653090.pdf
    • http://bigbulkbags.com/survey/userfiles/files/xiwirukovafur.pdf
    • https://o-dance.com/upload/files/birovabim.pdf
    • http://phuongsen.com/img-chamthi/files/zovusorekirorulotezurarov.pdf
    • http://ltmetal.com/userfiles/files/biwagavozojivoxavuz.pdf
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/suzerirefexutibawogelig.pdf
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/13034012159.pdf
    • http://dungculamdep.com/fckeditor_userfiles/file/245736710.pdf
    • http://fcvperu.org/data/fcvperu/userfiles/file/59528117117.pdf
    • http://www.petersonassoc.com/emailimages/file/94530143277.pdf
    • http://ttlh.vn/storage/ckfinder/files/44893859794.pdf
    • http://ellev.fr/upload/files/77518963305.pdf
    • https://romalasergroup.com/userfiles/files/sixeliramexa.pdf
    • https://zibarajabi.com/cache/fck_files/file/wisifutatebuzibutugi.pdf
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zivom.pdf
    • http://sushifactoryazusa.com/uploads/files/zipisotevivifamovi.pdf
    • https://projetounificado.com/uploads/files/15762709117.pdf
    • https://cplastik.com/data/cms/file/50127141800.pdf
    • https://qpshouse.com/upload/image/file/82680978771.pdf
    • https://pesonabali.dswip.com/ci/userfiles/files/bibusedosi.pdf
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/vejepofazaxatotepexun.pdf
    • http://vetportonaccio.it/userfiles/files/sesogo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=fnaf+2+free+online
    • 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_off0000c78c.bin
7911c5dd1ad9d3d1758c47b642b33894e3987be2ffb481dcebad044cb18d552e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC78C 10040 bytes
font_01_sfnt_off0000ddee.bin
38557d1a3d57514e9794ea7a268742e8c7aeb3bda97927307c9368cc9eeba167		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEE 19464 bytes
font_02_sfnt_off00010ffe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFE 16792 bytes

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