Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eae815ccfd84a6f…

MALICIOUS

PDF

80.1 KB Created: 2021-04-06 23:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7db08e0b8e0ed9e680b524a6eb81946f SHA-1: 99a2b4bced9a7a27cf8d05a6ee3c5b9dd8bc2603 SHA-256: 5eae815ccfd84a6fe667bfe2a442d0e21c48fa9c32d8615fca28d1c1a9967bc8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9998

Heuristics 6

  • 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 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://golowaki.ru/strik?utm_term=asp.net+core+mvc+custom+error+page PDF link annotation
    • http://tixaman.scienceontheweb.net/benim_hocam_corafya_video_ders_notlar_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/hVLgQhf/novodomigirod.pdfIn PDF document text
    • https://cdn.sqhk.co/wujugojuse/ieiiwbO/pibuf.pdfIn PDF document text
    • https://cdn.sqhk.co/bemapebe/gLUtGgj/ranoxodoxekajezuxo.pdfIn PDF document text
    • https://cdn.sqhk.co/wamamuli/ibhdB5j/adverbials_ks2_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/xelalizogim/jgh3ibs/3806900900.pdfIn PDF document text
    • https://cdn.sqhk.co/zijigemeworu/hvjjjel/79516172729.pdfIn PDF document text
    • https://cdn.sqhk.co/vajirasavuz/j4ikDhf/magic_tap_tiles_piano_edm_music_games_2019.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/wotodedaruzuk/99438854045.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9beb97a-4821-43c5-860b-7cc851a77153/how_much_do_baristas_make_at_starbucks_in_texas.pdfIn PDF document text
    • https://5f90d536-2a72-4461-adff-280afd3056cb.filesusr.com/ugd/27c394_20fb7dc76f924ceda77a95c23d1d5555.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be191360-7435-47b3-a0f5-80c5c794800c/86924073051.pdfIn PDF document text
    • https://67389751-14cc-4ed3-b660-7ef7239e4cc3.filesusr.com/ugd/bb5584_fcfe62cbe6d347a0b7cf386bb642ba9b.pdf?index=trueIn PDF document text
    • http://bitenozof.atwebpages.com/the_importance_of_being_earnest_summary_video.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/tree_of_life_tattoos_for_females_small.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9908ae27-6360-4d19-bad7-e29ea0e77daf/13436844213.pdfIn PDF document text
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_ffd1deba5f854a849179b8f18a3898eb.pdf?index=trueIn PDF document text
    • https://ececae0b-1312-4a4c-959a-117928b3d478.filesusr.com/ugd/e6721e_b8fc03142c2647bfaa439b44169cbbce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa0fdf9a-e561-444f-ae38-27fc6997bb8d/kituguvuzevubirik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef6ac8a4-0874-4889-9a1a-7c587719eb45/40850285928.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 5300 bytes
SHA-256: c544c7c2a79eaa9ffd0e27dee45ea092b4636d39675d731e7e1bc92cd80c5a95
font_01_sfnt_off00010aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAB 11724 bytes
SHA-256: c1b9f0fa04ca3a1272c62d8b1bac649ec95285efd70b2a680222bd8d496fb3b5

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