Malicious PDF — malware analysis report

Static analysis result for SHA-256 a758d7db7abe72e9…

MALICIOUS

PDF

83.8 KB Created: 2021-09-21 12:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ade6072c714e026f5009e0c272104a93 SHA-1: ebe0c9cacf7bcea06436e61c28a7723cf9a49294 SHA-256: a758d7db7abe72e935073b8ef46493c6164ff71d76345e6427810fd02b8ac8fe
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 a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to redirect users to various external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inwebjor.ru/uplcv?utm_term=sword+art+online+kirito+ggo PDF link annotation
    • https://southwestlooms.com/admin/userfiles/files/netopu.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/34691820935.pdfIn PDF document text
    • http://kalikraft.com/images/file/dorelunizadekedu.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/5789585615.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/22016132693.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/weroxumorozutumemojidobi.pdfIn PDF document text
    • http://fruitvita.com/files/files/vizirekitelumekidamibaxat.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/lotobanex.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/tapige.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131313d652e8---36106059120.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/futegiwerolaz.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/34142896444.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/vipeludadabifewevipevabip.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/mojukegovip.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/30463880624.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/zuparibodesovakorofixopax.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/35721405962.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/53874552908.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/wedivufimaramutavumolixu.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/bodum.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630552432.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/94614798227.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_off0000e483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 17484 bytes
SHA-256: 5408cf4565f85013f5c697f79e98f2f6f7f6524c2314b1060fc6519328a737c3
font_02_sfnt_off000129e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E0 10508 bytes
SHA-256: 3a6be691343b61c62b8a995fc6332fd6bb105fcddee20b9f283be239f7783e2e