Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ff4b3994f325e7…

MALICIOUS

PDF

82.9 KB Created: 2021-04-02 06:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ad8cad3507a5302f43ad6d4373831feb SHA-1: db5ff5da0ef898b34cd7655bf9ad1d3ac3371450 SHA-256: c4ff4b3994f325e70fae65b8215d5ba926894b061722554bed6f598995888244
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 0.9993

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://maypoin.ru/wix?keyword=scouts+many+marshes+or+derkeethus PDF link annotation
    • https://cdn.sqhk.co/suxepemup/NlUhh8G/jivikavebebuzuvewupavelu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374980/normal_602ba4f0ee0f9.pdfIn PDF document text
    • http://vizexibidoxi.getenjoyment.net/45716850081.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_602af900d498b.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawomo/cijLcXT/xugapop.pdfIn PDF document text
    • http://ruvujagefeko.mygamesonline.org/eiffel_65_blue_piano_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/polidupokasu/gidOJjH/wwe_universe_mobile_game_hack.pdfIn PDF document text
    • http://sogixusi.medianewsonline.com/purazenajitebopak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384304/normal_603d179ae76da.pdfIn PDF document text
    • https://cdn.sqhk.co/sepovili/4gddQib/light_reflection_worksheet_tes.pdfIn PDF document text
    • http://kevekozulanilim.sportsontheweb.net/516574322.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebesoxu/CbT1ghp/everfi_module_5_credit_scores_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/sabepakofo/gesKHIh/garuwovedatuledotulidutij.pdfIn PDF document text
    • http://zaxegod.getenjoyment.net/90676280197.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443372/normal_5fce2d0a0b22d.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/Ul0jijg/edit_photos_and_videos_on_iphone.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/zodererezuzuxi/38272272013.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/jewepamefedalulezolopuvop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78f0ce9a-ad55-43ac-a152-43f8570821f1/34377189241.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/ludisamotodorolitaxadase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd105c5-67bf-41e0-91e8-9bfbe6d3dbcc/98401224869.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/peter_barry_beginning_theory_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c0af73e-8d03-4652-9e90-9bd5dd24182a/how_to_become_a_peds_nurse.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/jexemedonakawexuxuxuwodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78ae54b0-0d05-4e93-a95a-f431bb6d652f/89661633620.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_off00010565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10565 5416 bytes
SHA-256: 30d19762730e440416a525baf3727aa8d98f2691c0391255c516856848096d4c
font_01_sfnt_off000117a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A7 11668 bytes
SHA-256: b3407cb85cca3bc205dc67047d9588d32e1f42a39bc561747c5a9f0df98c9763

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