Malicious PDF — malware analysis report

Static analysis result for SHA-256 9458b16758ef41b1…

MALICIOUS

PDF

75.1 KB Created: 2021-03-05 04:18:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c40b49feb05ca1ea2372e439f91bb6e9 SHA-1: 9a14b592f02e79440f43c47049e22834e1a1c2a9 SHA-256: 9458b16758ef41b13a72a9ffe0f5abdd55ae4eff74ad60d4f7969721c28de5e5
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it contains a mass external PDF link farm and attempts to lure the user into installing a browser extension or update. The primary malicious URL identified is resalured.ru, which is likely part of a phishing campaign.

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 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://resalured.ru/award?keyword=apple+visual+identity+guidelines+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374954/normal_5fdca9318222b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403820/normal_60184fdeaaab2.pdfIn PDF document text
    • http://kifipawatixitaj.iblogger.org/baptist_hymnal_songs_with_guitar_chords.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_9b7becb576594579abf06b953909a126.pdf?index=trueIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_83a35fb1dfe04f4ea27998330b9c31a4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/dj_appu_bangla_song.pdfIn PDF document text
    • http://bunakakivukutus.epizy.com/tosidame.pdfIn PDF document text
    • http://tanozetodane.rf.gd/archery_king_mod_apk_terbaru.pdfIn PDF document text
    • http://wonumamirevaz.rf.gd/account_lockout_tool.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/97105319906.pdfIn PDF document text
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_3b452bd02cc54c38ba43bc3cb0eed9de.pdf?index=trueIn PDF document text
    • http://xesidif.epizy.com/xulozixugerulolafim.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/high_speed_video_er_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/how_to_fill_air_force_form.pdfIn PDF document text
    • http://pejefovad.epizy.com/scenario_based_interview_questions_for_manual_testing.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/allan_kardec_o_livro_dos_espiritos.pdfIn PDF document text
    • http://jozorawoma.rf.gd/data_science_do_zero.pdfIn PDF document text
    • https://s3.amazonaws.com/dafumuxitupav/fewujudubegevizo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC54 5036 bytes
SHA-256: 7ab57eb110264b86e18e073d0c655f2ef2b1c7ce95d995e0a40a406e1f7c3294
font_01_sfnt_off0000ed96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED96 10388 bytes
SHA-256: 96fe71e17b8807a6d9ad707b0a5d2969eedae075216d0ec1d4da0d37e49fd12e
font_02_sfnt_off00011102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11102 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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