Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb21211b314ca73…

MALICIOUS

PDF

83.0 KB Created: 2021-09-09 09:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 112c6a40dd301efaf3116ebc0590d768 SHA-1: f56bb9d957bad55d05dffb64bce60cf8ee08802f SHA-256: 5bb21211b314ca73e8fb3ceb6f201896812f4a277f8925754f6464a8dbaf295d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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=how+to+recover+deleted+call+recording+in+vivo+phone PDF link annotation
    • http://filippodelvita.com/demo/userfiles/file/15410128853.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/sarobijuw.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/fubeketaveletefilojenik.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/48170722346.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/xuvozofabas.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/lijifarubepagumopaxalotor.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/fobesudajomotetavemimepu.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/fajov.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/48745040744.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109040758084384.pdfIn PDF document text
    • https://beautydent.hu/editor_up/3753984482.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/pogiro.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/xexawunovugulanodawe.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/dilinemizu.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/kifusuwus.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/65404304814.pdfIn PDF document text
    • http://potya.com/38085862213.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/lovixu.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/sanabotunagegijawenimag.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/mixelaxosowavuvote.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f8bc32f4d---66590002266.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/nivutigawi.pdfIn PDF document text
    • http://pasted-radio.de/web/files/99267570494.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/pejujipewebexixikupas.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_off0000dd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD01 10768 bytes
SHA-256: 7b9fc0fc281f3ccd7f73024b5103a60ba546ad6b39088432cc61476ba8141fd5
font_01_sfnt_off0000f579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8B 18548 bytes
SHA-256: 0ea3c82c3b56fb7618ceb160e200575d8ca3d5d799755f5d684151c25a042554

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