Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddad08ab0a1a70b4…

MALICIOUS

PDF

79.1 KB Created: 2021-09-25 20:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 678510f26fba0f6e52012232aa59af80 SHA-1: 906013d61064a8aded8e97b21630db7bd31e060d SHA-256: ddad08ab0a1a70b494804d7c52ae0027a78ae18713a849353d0ea389865b778a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one specifically pointing to a suspicious domain that appears to be part of a link farm designed to redirect users. The presence of these URLs and the overall structure suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=mywifiext+username+and+password PDF link annotation
    • http://stigstudiotecnico.it/userfiles/files/53707930940.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/99929055065.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/muxuniboka.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/golefagowa.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/movafo.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/39145873206.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/fosunoledewadulux.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/vutakozoze.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/44238125853.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/jevukulinosasonopolaja.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f004915737---25237248548.pdfIn PDF document text
    • http://bamor.org/userfiles/file/14204837487.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/junabivi.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/82235572998.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/41607653090.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/pademafefinefin.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/74617805764.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/47188851507.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210912093219.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d0d45af43f---wigetik.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_off0000cb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB41 11008 bytes
SHA-256: 0c042d36014d780b1b3881c4dd063ad572491b1b34adb186bdbb0e40a3207ee8
font_01_sfnt_off0000e4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EC 19060 bytes
SHA-256: f8c4a51cbdee22261606ac020a5c60921df6b06cb594ebbfdfba5831c3eb4dce
font_02_sfnt_off000116e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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