Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b793799ad089398…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 12:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f46569672b5b2c1b9b975fc9d1e7bcca SHA-1: 1bb84da7c931d03b1a5815ad8e3d719fadf5fc2b SHA-256: 5b793799ad089398b98b3897ec0d10428ead20fa9df2ccce6455fe751022ee53
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://partnercable.com/files/71492042016.pdf In PDF document text
    • http://unsersohn.com/images/file/xifujadale.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/42413324884.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/81782386523.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/suputavuralonit.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/37100886469.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/melaragerovolexerus.pdfIn PDF document text
    • https://theurbanthinktank.com/files/nozituzaxidaxeponevug.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/59870820676.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/mavupemixerabu.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/86495046333.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/rilizotedidezepavovulore.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149d78c97a12---rededewepimapedolep.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210903200024.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/38310213106.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/18291286140.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/99853787843.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/logupufapazumovu.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/fowegawuwuludiw.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/norofezupa.pdfIn PDF document text
    • http://dgkno.cn/upload/73367256857.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/72387165329.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/kozeroba.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/71706106295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=best+manga+app+android+2021PDF 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_off0000b045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC857 15120 bytes
SHA-256: b26c61d2089414e264a7bf22715cafd814c16ccd0bfa339c743e555985b89016
font_02_sfnt_off0000ee9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 11036 bytes
SHA-256: a539af27a1ca67fa87add0daffd5b544cdc4f004f853ddb93b3cf35cdb6e068c

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