Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc5bfa30e00d8dd…

MALICIOUS

PDF

88.9 KB Created: 2021-09-14 14:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0977f6c77231c78cb68509fc6a10db66 SHA-1: 4030fda2ecc8c1aede9adff2350b7fe840559fca SHA-256: dbc5bfa30e00d8dd996c345ea12fb53e5e76f595a3872f92b8345999b378f9cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. The presence of many links on disposable hosting suggests a link farm intended to redirect users to malicious sites, likely for phishing or malware downloads.

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 https://irlanc.ru/uplcv?utm_term=sp3+hybridized+carbon PDF link annotation
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b684032d6f---36997643944.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/tunofilezabulilidimusu.pdfIn PDF document text
    • http://beta-rc.com/upload/files/80499319843.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/ravizo.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/fefokujowosapibesuref.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/55023213943.pdfIn PDF document text
    • http://poiskvod.ru/images/file/51494471770.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/50358186461.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/66289642286.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/lezejadibig.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/xixugiv.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/88715970166.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319876a83f4---14271798064.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/9852355312.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/54178402404.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/fupevigufiduv.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/sujisaluvubi.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/dixus.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/susilix.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/3347896929.pdfIn PDF document text
    • http://deltools.com/userfiles/file/kovategikebodinoxusux.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/mosofivob.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/wadud.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/56403949288.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_off0000f0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 10860 bytes
SHA-256: 08cd79c9a542cf2d62a6d85768a915a90343b53e19f5418185b2c1c4fe5c2f08
font_01_sfnt_off000109a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A5 19844 bytes
SHA-256: 03514102db4c0e5dbfd4cf5d9392d79f5d69e0294d3ff660135ed6e87c921689
font_02_sfnt_off00013e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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