Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fdbe0261badddf0…

MALICIOUS

PDF

82.5 KB Created: 2021-06-05 11:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c7469a83c47d9ec6dafbfee28bf4a430 SHA-1: df7b6d0edd5d0e27fba740ea6efc2b2cb530e742 SHA-256: 8fdbe0261badddf04432034ea3716003b2e0a25a7b8a7a1a3eb8ab49b24cd962
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 0.9998

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://dafemum.ru/123?utm_term=also+sprach+zarathustra+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393779/normal_5fcd3e345ff6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481058/normal_602392c5b18ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416919/normal_601de7f35c8b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuzimotum.pbworks.com/f/christmas_song_lyrics_quiz_printable.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144413955/lanutefowin.pdfIn PDF document text
    • http://zowonixepor.pbworks.com/f/92116654153.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/street_dance_of_china_season_2_winner_mentor.pdfIn PDF document text
    • http://zeratuwolima.pbworks.com/f/50091331240.pdfIn PDF document text
    • http://vawaguzidatu.pbworks.com/f/vokakazuku.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/w/file/fetch/144633006/orgenes_del_cristianismo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d20952-cec9-4782-8725-41de6341073e/39217733724.pdfIn PDF document text
    • http://funinupun.pbworks.com/w/file/fetch/144418524/nudexumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a336193-0226-4eb3-9bfe-bc8bca357a86/how_to_install_a_glass_top_stove.pdfIn PDF document text
    • http://nolumemonip.pbworks.com/f/xojomifasikutunariloxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97e2789e-2809-4ff2-9270-10e5ad42ff52/32910832298.pdfIn PDF document text
    • http://gibuwodebu.pbworks.com/f/46082356415.pdfIn PDF document text
    • http://vadibun.pbworks.com/f/how_can_i_download_my_aadhar_card_by_mobile_number.pdfIn PDF document text
    • http://pebenuziwi.pbworks.com/w/file/fetch/144548352/how_do_you_wind_an_atmos_clock.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_off0000fa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA73 5284 bytes
SHA-256: a6dca5c3b5b457c41a5cf4189483478308db66913083c48a868105997af7541a
font_01_sfnt_off00010c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6F 15492 bytes
SHA-256: 952f54b0a92b1bb2a702c727ca3cad64c5436d6749b3464af83e90b1e8098fd1

Open this report in the interactive analyzer, or submit your own file for analysis.