Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb68a3ee1247b0b…

MALICIOUS

PDF

78.1 KB Created: 2021-03-17 15:40:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 21c6f53cb27c9ab2bee37b19401b9200 SHA-1: 590b2d812bfb0c5d537c1b03a570ca3ec9f30b52 SHA-256: 9eb68a3ee1247b0b79413b7a2168ea9005def107a6dfffc7a3523fdaaa03f304
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 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 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/award?keyword=american+english+file+2+teacher+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/dodamewope/xH7ijhj/aspergillus_species.pdfIn PDF document text
    • https://cdn.sqhk.co/bodosuruwalu/jadZ8gg/libumeg.pdfIn PDF document text
    • https://cdn.sqhk.co/nisisepolo/jihljg5/diced_turkey_and_rice_casserole.pdfIn PDF document text
    • http://in-step.shop/nyc_parking_ticket_dispute_reasons2cp8i.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/cifhaJx/truck_simulator_4x4_off_road.pdfIn PDF document text
    • http://storedubai.shop/collins_proline_21_vs_garmin_g3000tk732.pdfIn PDF document text
    • http://magnitoli-2ekran.site/45561051154ejbd9.pdfIn PDF document text
    • http://migerov.xyz/gobodenixitim9swzn.pdfIn PDF document text
    • https://cdn.sqhk.co/malakizojaji/shjRih7/civil_war_photographs_dead_soldiers.pdfIn PDF document text
    • https://cdn.sqhk.co/vomemubevu/idgf5ii/84266045477.pdfIn PDF document text
    • http://firstreadersclub.com/1130691288842l0o.pdfIn PDF document text
    • https://cdn.sqhk.co/dibidoretu/hdRZqgc/virtual_piano_sheets_trello_easy.pdfIn PDF document text
    • http://2022god.com/23465519209s78t3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://28a90398-13b1-4b58-b54c-ed045a6bddf2.filesusr.com/ugd/7e9e1f_c4be7a2f806f41eb830c37cdf7b57960.pdf?index=trueIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_09aabba42db444e281d5066746fdb1b3.pdf?index=trueIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_c2d7f31362f349668d9770a167a6129e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8192a205-e1d7-4a6c-a304-bfb60c52443f/wonibupofizapaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f0b66e8-9050-4d06-9fb0-216e0e3eb2d5/tenevufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94c916d9-5909-469b-b917-06a931285f2c/los_5_lenguajes_del_amor_libro_gratis.pdfIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_5bc6f23b5a844d39b7abd5928e7def9a.pdf?index=trueIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_14afb70c51d848d886f77fdc29905538.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_off0000e7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B9 5780 bytes
SHA-256: ed0dcf7bcf55dc4d3b4d0bbe4b0c57046d47aa08def33cc1d5660711937aacf0
font_01_sfnt_off0000fb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB51 14816 bytes
SHA-256: 4eea38fe58daf81d6831446247bff7f18345c69d2514823e23247a440a630529

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