Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1251898b749ea9…

MALICIOUS

PDF

70.4 KB Created: 2021-03-27 21:36:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 414491ad909e0994ca80f4b1ef6490f4 SHA-1: b1f2398ea9105e9b9338084d27cdfc9a8af17eec SHA-256: 5a1251898b749ea92b55401bb35b792eba44c8045c63a4bf2fa7715f49e449d9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/123?utm_term=ocr+gcse+maths+past+papers+answers PDF link annotation
    • http://wopexobow.mywebcommunity.org/spanish_alphabet_pronunciation_chart.pdfIn PDF document text
    • http://ritixibetono.mygamesonline.org/the_raven_queen_warlock_patron.pdfIn PDF document text
    • http://detozube.scienceontheweb.net/sowazowefuf.pdfIn PDF document text
    • http://kolegutoravi.mygamesonline.org/xafesuzevedajuliguzota.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_e1ab3fd0fda04a4ea88183deda21a9f3.pdf?index=trueIn PDF document text
    • http://ledukuxadom.epizy.com/67930952854.pdfIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_9e7db4191b65494383a0fc14d664ddca.pdf?index=trueIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_66324c01df6d4106b7a577420b3e8c27.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9bf008e-83e0-4507-a1a8-d4804cf18bd6/wokisomubenakuxokazajox.pdfIn PDF document text
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_c0654b00b0304ca9bdde97bf399b0a83.pdf?index=trueIn PDF document text
    • https://9c3086b9-336b-4a4d-b39c-975a2563a2e0.filesusr.com/ugd/f4f792_de4c9e36ac9f4460981b1fcdd8562490.pdf?index=trueIn PDF document text
    • http://kaxoxosav.rf.gd/jelonevizowu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3111d31-9043-4627-a7c8-af441598ab40/behringer_xenyx_x2442usb_multitrack_recording.pdfIn PDF document text
    • https://40fd9d30-e691-4ad4-9ff9-7de67b304886.filesusr.com/ugd/45b27a_48958ddbaed34a69b71e551a08275e9f.pdf?index=trueIn PDF document text
    • https://cf62593c-3f62-494e-9ef9-3c2a63ead7d7.filesusr.com/ugd/93dae2_01ba885cfb4e46749a359130e336678d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ba84811-909c-4125-87ab-ac5b78e1a6e8/powerwise_golf_cart_charger_instructions.pdfIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_f23597569fbf499c9334bd063a6caba9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/af00ab54-c98e-4822-ba73-32f426a80481/guzitebak.pdfIn PDF document text
    • http://vibirokudod.myartsonline.com/34945324964.pdfIn PDF document text
    • http://fozugafunu.epizy.com/tufoguxugitikotimagab.pdfIn PDF document text
    • http://simatan.epizy.com/xogifevazosififated.pdfIn PDF document text
    • https://52468903-0e2d-47c5-babb-61e1d305d291.filesusr.com/ugd/32777b_58855523d30d456bb25b6a6f1db62825.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BF 5432 bytes
SHA-256: ceacca48f3cbe2e96c61747c6b34eca8b834d13fbc2af48b67675ef2a920c360
font_01_sfnt_off0000e825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE825 10628 bytes
SHA-256: 029a102c1de9ff4b5bc21d7bf81421a4b42158ec7912355633b8af706c63d209

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