Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93542df627face9…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 20:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8a772f9bd38bf42883226887c01b0c0d SHA-1: 5515733a339c3ab6a007d323d86f32a09da9dea0 SHA-256: a93542df627face9cf6c3c2d630eab6e7c3dfe981e23f21831daca10fbac12f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous PDF files on disposable domains, with one URL specifically containing 'store samsung apk' suggesting a potential lure for malicious app downloads. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://laborke.ru/uplcv?utm_term=store+samsung+apk PDF link annotation
    • http://drivingtesttips.ie/fckeditor/userfiles/file/liwuxumadazagexezenuz.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/solukaloz.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/vobomavemoleje.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/75444499392.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/pokotereb.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/70454867928.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/nexakozetafes.pdfIn PDF document text
    • https://phr4u.com/files/mitibilalomunug.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/28901971949.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/segasomuviminif.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/30266183542.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/161360d71e9d28---51135736710.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/fufedojasofijof.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148858371922---roparusurumadugovunol.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/51441895344.pdfIn PDF document text
    • https://kawanmto.com/contents/files/xuwomu.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/wojesedukodaz.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/32898780714.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/65926912227.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/84871373231.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/92837064054.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210914_64D46B634601B5F2.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/83348905204.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/lisuwatexoxotozomu.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/20977616107.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_off0000d61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE34 10724 bytes
SHA-256: 73799a5546dd1f2a3dfc51bd71524a47b1852713890d55950879689251f64981
font_02_sfnt_off000106da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DA 17480 bytes
SHA-256: 5164700b98199f415ae7fffce9c5688e94c03a68dd337a1a6f974a92b21328f9

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