Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b31a3e1c505ac1…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 22:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 74f1b2cc4b3cfa7c818192d45413556e SHA-1: ed61fc543ece2daf852f067bc89515b041efbec3 SHA-256: 36b31a3e1c505ac1da3542b60cc0b7e60d4387b280ae745347606eb8a035ccd7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to trick users into downloading further malicious content. The presence of a 'download button' heuristic further supports this phishing and malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://salman-is.com/userfiles/file/39234202709.pdf In PDF document text
    • https://777mto.com/contents/files/wuxozibusebepiduf.pdfIn PDF document text
    • https://12shio2.com/contents/files/lifafedijo.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/nadapego.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/87181755240.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/76354519270.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/xijabuxufitu.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/dipamazojatojiniponowa.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/kediboziwudemediletorudoz.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/tufurabarolafuzisim.pdfIn PDF document text
    • https://hobbypet.cz/files/file/megulusaduwinexakopufudes.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/22324465254.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/87636331862.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/fugubon.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391a5334236---63754653972.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/degebanimobarusulupimu.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/sibavajurojozasukufora.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/libawunozabudamepi.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/pazozezexafiminofa.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/77328183848.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/94962247541.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/digamuzegodipafagomamib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=windows+xp+movie+maker+for+windows+7PDF 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_off0000d7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEA 10904 bytes
SHA-256: aa67c52691dd9f5f9a0697b970f17939bfbef482490aa417d28f75a4175dc000
font_02_sfnt_off00010934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10934 18808 bytes
SHA-256: 2e2af8239d96678724173f0f6404870c87f7dcb421e82854cac52f777b66e820

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