Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2317bba69d0860a…

MALICIOUS

PDF

72.0 KB Created: 2021-09-26 00:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dc618e02bbb9b60e632086cfe5a2dd6c SHA-1: 06caf12819b24d07930ade6d6cf38356a9e80588 SHA-256: a2317bba69d0860ab64d5ab8d04b335fa2152ba02641ce920cbeed8ccf55d664
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and a machine learning classifier, with heuristics indicating an embedded JavaScript stream and a high number of external URIs. The presence of JavaScript suggests an attempt to execute malicious code, likely to redirect users to phishing sites or download further payloads. The document body was unreadable, but the heuristics and numerous external links point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=where+is+storage+in+my+phone PDF link annotation
    • https://rabudiagnostic.com/userfiles/files/lonipimot.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/sanomasum.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/sekadejotiki.pdfIn PDF document text
    • http://citra.cl/userfiles/file/42160615603.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/musalotonumutiponopunerob.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/wizaxikiposonokifolekowu.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/72250850999.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/xekomuvurogute.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/18760110868.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/29050592159.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/31753415702.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/61524558258.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/86897540449.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/fozogoderoxan.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/75809752962.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/46081629848.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161468091078ed---bofumodesorezufinelo.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/zerezatiso.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/79161982346.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/97581159837.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/82523664395.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/xoxegovolifet.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/wimegisikarodukogopisunod.pdfIn PDF document text
    • 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_off0000b315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB315 18004 bytes
SHA-256: 9ccdbbc2ebb2b8271e6aa7b9d8d758eb64f00c14d51295a928c1c2e0c8080deb
font_01_sfnt_off0000e199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 10760 bytes
SHA-256: d630659f81c939b0d5a264ba822a748de71462cb9e17733957956f5a18fb8e71

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