Malicious PDF — malware analysis report

Static analysis result for SHA-256 80abbd9aea514054…

MALICIOUS

PDF

68.7 KB Created: 2021-09-18 11:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ea3deff7ab9a69e3370f1f14744123d SHA-1: 37dad46753df02dc182d074a621fecdf8e468c25 SHA-256: 80abbd9aea514054378d651c8556bff3c13c79f10db0fade2b1589cf00645d2a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'SE_LOLBIN_RUN_COMMAND' heuristics further supports the phishing and potential execution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://queure.ru/uplcv?utm_term=i+want+the+cloud+game PDF link annotation
    • https://bokaichenyu.com/upload/files/walemazawo.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/wudovo.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/safugaxadekekujuvu.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219161528539593.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16141138c7b38e---53349957313.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109071511035848.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/fegomume.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/kabofuvumonidad.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/zirukudebopijiveteloli.pdfIn PDF document text
    • http://hidramaco.com/files/files/88636319206.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/figadikonogasifexuxatut.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/xadofujikafa.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/10791984717.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/japevomasikak.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/kokunudozenatoza.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/48749407072.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/87310981922.pdfIn PDF document text
    • http://spbi.cz/res/file/wuresajanirujigijuku.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/96610184611.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/wenalisis.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/bemobetedafedozotazora.pdfIn PDF document text
    • http://slkuang.cIn macro / runtime command snippet
    • 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_off0000ac98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AA 16244 bytes
SHA-256: 5479815f016c576ba348af9fd3d10c7c4a30cc18d9f3ecce210d1593d36d878d
font_02_sfnt_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 10596 bytes
SHA-256: 9adcec96daeb6946f753eb8f3240a3bab79728afac36f06faf7729d7d56a52c4

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