Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7816dbe5a1f0372…

MALICIOUS

PDF

75.0 KB Created: 2021-09-21 13:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dd565653bc00b35b98daa35e39d65fc4 SHA-1: 261923e46c25e1c89b80919f0fccfab726460ba2 SHA-256: e7816dbe5a1f0372cb5c4a57f00bf4f5e1dec85a46aa31cde5469b0b34807395
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external URLs, many of which are linked to link farms and disposable hosting, indicating a phishing or malware distribution attempt. The presence of embedded URIs suggests the PDF is designed to redirect users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://crewmak.ru/uplcv?utm_term=can+facetime+call+android PDF link annotation
    • http://lohoithaiduong.com/uploads/files/89916583953.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/23626220312.pdfIn PDF document text
    • https://e-room.co/userfiles/file/57136896439.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/finomokopos.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210916_140356.pdfIn PDF document text
    • http://thepducphat.com/upload/files/97523229229.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/23110433881.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136b67ff323e---zulunibop.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/gudajorowejenafoboba.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/9461607941.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/48749757322.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/murufitelobotafo.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/buxomuwifodofinixifaxut.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/51601572355.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/28444518389.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/31623145428.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/lunataku.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/1985536450.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/16443413774.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/38676372531.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/jupinajaloto.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/47895616031.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_off0000c268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC268 10500 bytes
SHA-256: 9d1703ea0da7bb7016bc57148bd10c0ddc90da805c30ea2fbe3589751a38b0ac
font_01_sfnt_off0000da42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA42 17260 bytes
SHA-256: ff3a19484c786dc32e36c3217fb71830865c13ab6e917016d7f1ffb6a902bdd4
font_02_sfnt_off000106a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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