Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b75a3c7e65c6b4…

MALICIOUS

PDF

81.9 KB Created: 2021-09-24 10:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 88537e4a2665548f2c9993f33ff9b7e2 SHA-1: 084a9f11f782e5fc1b778852eecaf796fcea0b9d SHA-256: e2b75a3c7e65c6b47391fd70105b58fcdee81365e1d10067f86239169fe7f8d3
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 that point to external sites, some of which are identified as part of a link farm on disposable hosting. The presence of these URLs suggests the document's primary purpose is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://drafthe.ru/uplcv?utm_term=android+horror+games+2020 PDF link annotation
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134f9840097a---riditi.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/82085934775.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/86835065979.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/46807248046.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/zafejeririjubenogatuwige.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/7367360190.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/juzob.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/44436042192.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/50856517675.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/nowadatem.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/68907028112.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16148e62fc0625---84360772297.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/wibor.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/6189207247.pdfIn PDF document text
    • https://sujatasfoodopolis.com/ckfinder/userfiles/files/foladusijademo.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/bixatoneruletadaturud.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/92832946602.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/87068363150.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/babovalop.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/gexezeloguxojidij.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/kiwujom.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/38260132544.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/pizodububifowopawuk.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_off0000de92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 10776 bytes
SHA-256: cc28602742325ce64bb3188506c17a4e34f1e3f5d79743b9d8c67bf84536c434
font_02_sfnt_off00010f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1C 16732 bytes
SHA-256: cf0ec1e410c45c45ab54347e390ff49b43f117787990d21647ca49a4dbb198e0

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