Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac050a76bb8a17a…

MALICIOUS

PDF

86.1 KB Created: 2021-09-10 16:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 32f6efeb9e926e1374afe8195d781b66 SHA-1: e3a4fab864d48c5426cf1a0ecc3a2d5d603bb65a SHA-256: 9ac050a76bb8a17a62e41b74d72c807dd1be0af0dd730c53b03e1c93cd582d5c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to obscure the ultimate destination. The presence of external URIs and the 'link farm' heuristic indicate a likely attempt to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://kimsanghun.com/upload/userfiles/file/2021921651360415.pdf In PDF document text
    • http://skogsformedling.se/bilder_umeny/File/44118959731.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109070730068363.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/74035514801.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ade495f76---48831648143.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/sitilitatazobotel.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/meziwosevu.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/banuwidu.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613987b77d834---pagulatida.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/wugapizipimebukigi.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/kodolusu.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/pewexitujobimam.pdfIn PDF document text
    • http://plise.org/userfiles/file/68127079792.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/47229657445.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/85837732647.pdfIn PDF document text
    • http://wamer.org/userfiles/file/607526936.pdfIn PDF document text
    • http://praguetransfer.com/files/file/wifogak.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/98090411508.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/zinisidiwirixifazoj.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/poxotudegusud.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/45024291967.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/48367000466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=chrome+complete+dark+modePDF link annotation
    • 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_off0000eb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10342 10536 bytes
SHA-256: b8e18e36c39ad2bcd258b87ac2c0ee07ada083ac8f9e8e0cef37ee0f78b99332
font_02_sfnt_off00011b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4D 18200 bytes
SHA-256: 35ba50e03464f0362802be1ab83240c3696b2de35b79bf0c8a67819f8d298b99

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