Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21d3253f7e309bf…

MALICIOUS

PDF

76.6 KB Created: 2021-03-12 19:38:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fae9959805bfa83ade0b2fcaa781090b SHA-1: e94e7850362343848e1d27127a868c2d052049ae SHA-256: e21d3253f7e309bf100934ae4f86c4703f0509ac09913529ad0a20aeb043cd37
134 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 and presents a deceptive download button. 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/wix?keyword=fpse+android+apk+cracked PDF link annotation
    • http://huseyincanx.com/lachen_und_weinen_sheet_music1k348.pdfIn PDF document text
    • http://micrometer25bill.site/ping_pong_gamesb38qk.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/56898207903.pdfIn PDF document text
    • http://zedateve.mypressonline.com/wabipevakagarivawexelegu.pdfIn PDF document text
    • http://creditscoreusa.info/whatsapp_free_laptopshzp8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd1cbc1c-0735-4e9b-ad2d-2f77879b20e0/mejores_frases_de_el_monje_que_vendio_su_ferrari.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/39000640872.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/nogokozirikudaruforop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb35e5fc-2582-4cd0-8fa2-c8340d616c96/2785335984.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04c335d5-12f8-45de-b58f-62c28cec9de9/63108322334.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/953a7cd2-86f5-46d1-bd9e-59ce748e1061/87165670248.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbf36510-54dd-46a1-8c55-037d5031b4f4/how_to_add_audio_driver_to_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53efb561-62f1-4602-aabd-8b17c0fd2c6d/what_transducer_comes_with_garmin_echomap_73sv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f74be0d8-0604-4e5c-9491-7f0296a6b759/what_is_the_importance_of_visual_media_in_your_life_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcfaf709-4477-4bda-b6ce-ac7362b004c0/76195332771.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/loniwalometeti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/806bc332-e78f-4939-84ab-20f21db412ae/cardo_interfono_scala_rider_g4_powerset.pdfIn PDF document text
    • http://xutenujute.myartsonline.com/64259686362.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_off0000e889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE889 5052 bytes
SHA-256: cd6f6206a3e962a3576b4368c5cb5d706c9e517e9dbcd1428997966aba984da1
font_01_sfnt_off0000f9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 15876 bytes
SHA-256: d773b20208c292176359d11a82f967672df742ddcc04f72690b348296a7fc603

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