Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd5bcda96574627…

MALICIOUS

PDF

76.0 KB Created: 2021-04-03 07:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c8594d563c994b40b8c7ce2a315a2ed9 SHA-1: 3de6fe46c03bac0ee11d65524542da1c727f6056 SHA-256: 7dd5bcda965746276e6ea395273c692eafa0f31604c9d19fc22c45348b5cf159
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 0.9997

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://pelibifir.ru/award?keyword=articulos+cientificos+para+ni%25C3%25B1os+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486969/normal_5fe8b517854b6.pdfIn PDF document text
    • http://edarudost.online/where_is_sydney_opera_house_located_in_australial3ic2.pdfIn PDF document text
    • http://salonop.xyz/how_to_turn_on_my_gas_fireplacehoi0q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478716/normal_605d8682263c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473642/normal_605f00e5c03d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477886/normal_5feda842066e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464323/normal_6001be6c3402d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pidufozu/vusoredopupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a168302-e78d-4a07-b200-911f56ed449d/woraxososoxowowamedavaj.pdfIn PDF document text
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_28903c260ea44126ad710510965bbb45.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/bafuripaxodefitejilibobo.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/greensleeves_piano_sheet_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/ahimi_pema_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce12a74-95d0-43d2-9692-4dec6363a4c6/tie_blood_knot_fly_fishing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa9be8fb-3f03-40d2-9e76-48cdbf0d5ce1/vox_valvetronix_ad30vt-xl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b3dd963-66c3-40a3-95fc-acb5b466e271/ethical_hacking_books_free_download_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37f59415-1644-44f3-9d06-e946cc555cdd/61880532283.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/fikuxirenogijobinuja.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/read_children_s_books_online_free_no.pdfIn PDF document text
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_a7efefa2e05c4316b05e886d02400378.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_off0000e823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE823 5348 bytes
SHA-256: 7022796960e040e5beab5978d53f1f221042aa861bc8d64ed8ea29d80d7fc7d9
font_01_sfnt_off0000fa22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA22 11784 bytes
SHA-256: f95245fd136d91689e2109a9b1588298388b298617de2aefda43e997dc68122b

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