Malicious PDF — malware analysis report

Static analysis result for SHA-256 426a16ce235983d7…

MALICIOUS

PDF

86.2 KB Created: 2021-03-24 06:15:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58fcab63719d53e1d2520d33b33d2c5b SHA-1: 7f4e4fa03e6e92a936cf9c1e3801c28c29512dd0 SHA-256: 426a16ce235983d7c8eb9f4f3f13a24c0c9a295578d84ee80df937ef0b999b26
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, which is likely a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, suggests a context of providing a 'book pdf' to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=fundamentals+of+computer+science+book+pdf
    • https://cdn.sqhk.co/xemugugafot/bMiajgS/hoverboard_injuries_2018.pdf
    • https://cdn.sqhk.co/benibavagoge/iifibhi/36646350313.pdf
    • https://cdn.sqhk.co/fofodafexadu/rgcyge1/dexilifapolomixafu.pdf
    • https://static.s123-cdn-static.com/uploads/4465938/normal_5ff65ac91f9ca.pdf
    • https://cdn.sqhk.co/papowepu/gcPkgcm/wolf_wallpaper_4k_mobile.pdf
    • https://cdn.sqhk.co/golizojuw/BW9jfbK/cute_teddy_bear_wallpaper_free_download.pdf
    • https://static.s123-cdn-static.com/uploads/4391634/normal_5fcf31ef11a66.pdf
    • https://cdn-cms.f-static.net/uploads/4496389/normal_6025eb9f49290.pdf
    • https://cdn-cms.f-static.net/uploads/4414847/normal_6041e0e9bba53.pdf
    • https://cdn-cms.f-static.net/uploads/4501486/normal_603f48d02c2aa.pdf
    • https://cdn-cms.f-static.net/uploads/4489852/normal_5fd9c816294dd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/631336e3-7a6b-4c8e-92d6-9de5aae83627/history_of_us_china_relations_timeline.pdf
    • https://uploads.strikinglycdn.com/files/d0108c9f-fa43-4c2a-b194-b39dce77079c/naruto_databook_stats.pdf
    • https://uploads.strikinglycdn.com/files/e82ec9ac-ee12-4a92-a214-aba03c1b43ad/another_word_for_good_sightseeing.pdf
    • http://boraxijud.epizy.com/bibenabenopepijatipov.pdf
    • https://uploads.strikinglycdn.com/files/733becb3-ddfd-42de-8afd-fde7b912d1b4/ib_physics_ia_criteria.pdf
    • https://uploads.strikinglycdn.com/files/b5c8b032-90d7-4c48-8e74-8efb9ea57f33/49088197159.pdf
    • http://pexefenebize.epizy.com/guided_reading_jen_jones.pdf
    • https://uploads.strikinglycdn.com/files/ed940341-66c8-41a7-8d1e-231441e023d3/56195815784.pdf
    • https://uploads.strikinglycdn.com/files/a2cf5511-a7ab-43c4-a67f-04fea6229f49/what_is_the_perfect_form_of_a_verb.pdf
    • https://uploads.strikinglycdn.com/files/c1867ccf-1ac2-49ff-8b1f-e6f1627437ad/how_to_write_about_reading_a_book_title.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001129e.bin
8ad95a2f4df88292ac18c992d6274d41a846c49759e159f7253d8bf7c149898a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1129E 5460 bytes
font_01_sfnt_off0001251b.bin
adea6060ea776b473cb2785dbd90b7dbdf0d7e5330d88cde12f0c403021f2976		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1251B 10712 bytes

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