Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e81eeac1ab89ae1…

MALICIOUS

PDF

80.7 KB Created: 2021-09-15 11:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: abff4beeab14957d8edc686b618f603c SHA-1: 8c967ccdbb5b19e3114030a75f1200cb59099e48 SHA-256: 5e81eeac1ab89ae16c76abc9669d895b08464508a4e4d46b468f534ffe5a4d4d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains numerous embedded URLs pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm designed to obscure the true destination, likely a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://philabc.ru/uplcv?utm_term=understanding+and+using+english+grammar+workbook+5th+edition+pdf PDF link annotation
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/remijogeninelupifisoparaf.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/patid.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/kuvenedi.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/97535483096.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/48507863602.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/3792507165.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/59366760589.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/6994777758.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/duwotosumumoletojux.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/56240215456.pdfIn PDF document text
    • https://begili.com/uploads/image/files/zopexelaribivewejotiwu.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/witerunofajimubuguzup.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/48096409049.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/xuxoja.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/43101173719.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/nobenavazuwezitit.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/30451785330.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/20444002193.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/88819033704.pdfIn PDF document text
    • http://wjcopy.com/upload/files/bekure.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fe2ad5cec---pumerakag.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/naxuvevexesulevevu.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_off0000d43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43B 17672 bytes
SHA-256: 8de42f9e06fea80c1517a4d65fe5d911b6b6f3a6969b5a1772a0f0b928a101d6
font_01_sfnt_off000101cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CF 11504 bytes
SHA-256: de19f16c7fa028bcf65c7f6b56bbd5a840ec65aabe397ef94cd23bbbeef60b0e
font_02_sfnt_off00011c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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