Malicious PDF — malware analysis report

Static analysis result for SHA-256 53efc8eaf57ca4cc…

MALICIOUS

PDF

81.3 KB Created: 2021-03-14 21:41:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e6fa8ead95e37847d0c6f7e8ef72b31b SHA-1: 067fb35697f621bbf3b1210032a6e31a658c04c1 SHA-256: 53efc8eaf57ca4cc7ad3aed78916b947b707d48ca41d0365a95fb53a5a4c90aa
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV also flagging it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains references to 'Adobe Photoshop 7.0 apkpure', suggesting a lure for software downloads. The PDF contains a significant number of external links, many pointing to disposable hosting, indicating a link farm designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/123?utm_term=adobe+photoshop+7.+0+apkpure PDF link annotation
    • https://lesaletalakiwop.weebly.com/uploads/1/3/1/3/131379456/903122.pdfIn PDF document text
    • http://xeboxemovev.66ghz.com/mall_of_asia_map_guide_inside.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxogatuv/fULcxIJ/97145144973.pdfIn PDF document text
    • http://takodevizol.iblogger.org/40153806732.pdfIn PDF document text
    • https://xejotonevuxujuj.weebly.com/uploads/1/3/1/3/131379732/lidevenut.pdfIn PDF document text
    • https://rabavuvorek.weebly.com/uploads/1/3/1/0/131070866/xamolinalizi-pijotuno.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/HixyifG/hattrick_cricket_bowler.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc3c46b-57d1-4979-9dcd-8aa2097e92c7/how_to_be_a_better_icu_nurse.pdfIn PDF document text
    • https://770cee9b-59ea-4c2b-ae8d-aad83b0abb79.filesusr.com/ugd/8b25c7_3b3baaad40c047d488c98bf958d12275.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/69ca0673-9f47-4e73-842c-d55b46979da2/91028199882.pdfIn PDF document text
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_1d0d0d932ef54699842afea55cbf9681.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/300ee653-6966-4495-bcd5-cb1fe269681f/31809546036.pdfIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_a05b10d55aad4354a93669836825ade9.pdf?index=trueIn PDF document text
    • http://pimovutune.rf.gd/genie_2022_parts.pdfIn PDF document text
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_617c22276a0d4ebb9cad7f6faa2a8d20.pdf?index=trueIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_256737d2966a413890195ca4f8ee2493.pdf?index=trueIn PDF document text
    • http://bofozavo.rf.gd/2p_nes_emulator_pro_apk.pdfIn PDF document text
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_547f5c3cc1974b14a95d87d5d935806c.pdf?index=trueIn 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_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 5460 bytes
SHA-256: d11176d28c84e66aa6b9b8da5b519d6d1203a756baf39cb1ff00dd4d10bfc81e
font_01_sfnt_off0001136e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136E 10732 bytes
SHA-256: 6e3ae6243fa86c3baefb1bac4d6e01ab9fdcdc3c6baebb5d6020bf012735b254

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