Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4c901ec8798221…

MALICIOUS

PDF

75.6 KB Created: 2021-03-16 07:58:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: efb6562484bc7035bd3af935e5b1c377 SHA-1: bd393c89057db134e328aab69f8e73b412976047 SHA-256: 5a4c901ec879822182ce48d6e883dcc006f34104d3c335c9447cc613f1c6fb34
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The PDF's content, though heavily obfuscated, appears to be a lure to a site that may host further malicious content or phishing pages.

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://botokaw.ru/award?keyword=quadratic+equations+and+inequalities+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484993/normal_5fd088419bed9.pdfIn PDF document text
    • http://gakawisogafuga.mygamesonline.org/bogob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393345/normal_5ffa3c1c321a4.pdfIn PDF document text
    • http://pilavaxutuwu.22web.org/how_to_become_a_good_public_speaker.pdfIn PDF document text
    • http://kekijojovif.sportsontheweb.net/saxukokepozebi.pdfIn PDF document text
    • http://datekal.22web.org/critical_ops_pc_version.pdfIn PDF document text
    • http://pivojowemetobiv.mywebcommunity.org/network_topology_notes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://petilawunabebi.epizy.com/basic_arabic_words_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0553c2f-3baa-42c1-8b88-f0944db93e1f/how_to_draw_a_graph_in_science.pdfIn PDF document text
    • http://wodixosikomo.rf.gd/96185366971.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/the_white_tiger_movie_budget.pdfIn PDF document text
    • http://wififeju.atwebpages.com/54577318062.pdfIn PDF document text
    • http://gepikadagutuv.epizy.com/adolescent_depression_screening.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/bluetooth_app_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/baahubali_songs_tamil_masstamilan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ddec1b0-88aa-4479-8e1d-cf34667cf217/vozixulawagixiti.pdfIn PDF document text
    • http://bisenozet.epizy.com/igloo_33-pound_automatic_portable_countertop_ice_maker_machine.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/liluwemuvup.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_off0000e85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85F 5336 bytes
SHA-256: 3f48b6fde7e139c0bfd2e80f64a0dbb66b06bebe5baca9213c66de7fee86e8eb
font_01_sfnt_off0000fa90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 11164 bytes
SHA-256: 3d3ced6a35e3b8d4ec9f6bfba5cbdfab479045ada034aeb1a85c5e29a639eea7

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