Malicious PDF — malware analysis report

Static analysis result for SHA-256 0961c1f6f00e657d…

MALICIOUS

PDF

77.8 KB Created: 2021-04-07 11:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4f2aee53d182b7c6a068669b139dbcb9 SHA-1: 3ef1090c65275cb650e8ca9cbf0c000b0c21519d SHA-256: 0961c1f6f00e657d5b9215180b900cf827a49ede64988c3b30e4daf3cae73471
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though truncated, contains a query about search bars, which is likely a lure to direct users to the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/strik?utm_term=how+do+i+get+the+google+search+bar+on+my+iphone+home+screen PDF link annotation
    • https://cdn.sqhk.co/dinigivo/ciagdih/max_volume_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/dxhfehi/best_minecraft_java_adventure_maps.pdfIn PDF document text
    • https://visemuturivawo.weebly.com/uploads/1/3/4/6/134673250/6196827.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/gjawgTE/muscle_car_drag_racing_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/gasalikuviz/ghdhct8/nobenetisafakumasomefi.pdfIn PDF document text
    • https://runobutadafe.weebly.com/uploads/1/3/0/9/130969205/tumanit.pdfIn PDF document text
    • https://cdn.sqhk.co/pizililiv/bjhr46V/tiny_tanks_2_player.pdfIn PDF document text
    • http://fexabudobix.getenjoyment.net/4994276023.pdfIn PDF document text
    • http://rezumitisud.mygamesonline.org/leposimovoxosufozalebube.pdfIn PDF document text
    • https://labelamujevodit.weebly.com/uploads/1/3/1/6/131606697/4676940.pdfIn PDF document text
    • https://cdn.sqhk.co/sozivowemin/jfSmhaQ/56380094367.pdfIn PDF document text
    • http://lomuwugevona.getenjoyment.net/jipel.pdfIn PDF document text
    • http://pirunumilusarib.sportsontheweb.net/27184731334.pdfIn PDF document text
    • https://cdn.sqhk.co/gewewoturila/bTXigha/wii_u_emulator_ios_12.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/wiremeresegikon/87899185077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43b47d82-0545-4e33-82f3-926b27315c09/honda_civic_2012_service_manual_download.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/el_camino_netflix_parents_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7900aa27-4631-4635-90f8-65451290264c/55593497163.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/26477973862.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/american_history_x_full_movie_free_online.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/best_android_phone_under_10000_4g_volte.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b85c04f-3830-4987-8890-64853ff0721b/pewosasojifuwo.pdfIn PDF document text
    • http://samesesodore.onlinewebshop.net/kowa_ap_7000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb1c0a47-df6e-4412-b21e-0b9f3baf74d8/tp-link_tl-wr710n_hard_reset.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_off0000f1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 5780 bytes
SHA-256: 5b6efd8fab1f16e95955423d5c770b074841e880164c2da64fbb4439ff972f3b
font_01_sfnt_off00010586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10586 10420 bytes
SHA-256: 7b7789209524df8a45d8654de98ae78f1911cf2c2f326e6ca268dfad680cd393