Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4227da84fab992…

MALICIOUS

PDF

75.2 KB Created: 2021-01-26 07:23:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 953d008be658c6d036c471e4ef4aa282 SHA-1: b2b31bea370c9d83a43826797b7625e8f4941e01 SHA-256: 5c4227da84fab992c0b162fcb864bed276ae1573e8b541487685cb5a22dbb700
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable domains and Weebly subdomains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution lure, likely leveraging embedded JavaScript for redirection.

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://maypoin.ru/123?utm_term=zombotron+2+unblocked+weebly PDF link annotation
    • http://lifeit.pro/ruzetuwalh6tu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421050/normal_5ff7d0a3c0d12.pdfIn PDF document text
    • https://munipepuxorikoz.weebly.com/uploads/1/3/0/9/130969311/goniw.pdfIn PDF document text
    • https://buzijivugaza.weebly.com/uploads/1/3/4/7/134709386/bijudubo-koriwatipob-bulal-lakefazirodun.pdfIn PDF document text
    • https://dudenaluwesugo.weebly.com/uploads/1/3/1/4/131453650/9667946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368768/normal_5fd91c4a24730.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366027/normal_5fcd144f153e2.pdfIn PDF document text
    • http://stickerrus.ru/green_dress_pants_mens9268b.pdfIn PDF document text
    • http://mnclassis.org/usar_cabify_en_madrido5yba.pdfIn PDF document text
    • http://zathkatow.xyz/mudstone_brick_dungeon_terrariaoxhc1.pdfIn PDF document text
    • http://itgermany.net/mirenigonempaho.pdfIn PDF document text
    • https://xifofenanupov.weebly.com/uploads/1/3/4/8/134857182/fd8234e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491450/normal_5ff2d5a732615.pdfIn PDF document text
    • http://basiditdcf.space/wupisukukosiberapak0ucm8.pdfIn PDF document text
    • https://daxogane.weebly.com/uploads/1/3/2/8/132815110/ee6afa108b286.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/inkredible_handwriting_note_apkn8rxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tenunud/chemistry_book_11th.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/komplikasi_atonia_uteri.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/nahuatl_dictionary.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD430 5184 bytes
SHA-256: 1add6a52fd349205611c897d9c78df914eec8183cfda8ead956e5773b4a5862a
font_01_sfnt_off0000e5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D5 10912 bytes
SHA-256: 391ac9b1604bdbc6fb7aae96e8f907fb51c1a23f82fc57aa51e9027ea0c11b1a
font_02_sfnt_off00010aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA1 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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