Malicious PDF — malware analysis report

Static analysis result for SHA-256 28aacadac781a379…

MALICIOUS

PDF

69.7 KB Created: 2020-12-20 20:12:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 457ed41354cf3436ed47477da484ddd2 SHA-1: 300a3c7cbfe5cb9afd340242dc41e2cbf4cb8c54 SHA-256: 28aacadac781a379ea6154eccc11029705ece5df021fb47aa1e238b6143500f8
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to a suspicious domain, likely intended to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to medical recovery, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/aws?utm_term=recovery+from+chiari+malformation+surgery PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371788/normal_5fc71a6876b76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371788/normal_5fb95ed9c8578.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461234/normal_5fa5be63844e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420589/normal_5f9eb2b281f74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408324/normal_5f97028840978.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370269/normal_5f8d3287a0e39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481173/normal_5fc3bdfa65752.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://uploads.strikinglycdn.com/files/eb9d9207-1103-4910-9170-6afa67414b60/sajosoxabifukupesurire.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc79c85e71df64d6bd9c29/t/5fdcab973bd3a53b5e8cba4a/1608297370341/latest_android_games_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/84331668158.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/twist_of_fate_season_2_full.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e4a49bd-3e7f-48ab-9946-09ef2bfbf10b/bexikupurevolikokop.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_off0000c6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DA 5348 bytes
SHA-256: 898c966277ad4a73c206a82ac8b38c05182c52773de8f2a02280177d8e7c5a17
font_01_sfnt_off0000d8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EC 10236 bytes
SHA-256: 1f7165e18cb6ce999d7ee8a59597ebb45c75507e769276a9146213a0172d17c1
font_02_sfnt_off0000fbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEC 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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