Malicious PDF — malware analysis report

Static analysis result for SHA-256 33afbc081a76855d…

MALICIOUS

PDF

73.8 KB Created: 2021-06-11 06:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e4b618be801a64b8948934bfc12d1659 SHA-1: 0b18dccf7134fd77b917763fc20b5e8b60346701 SHA-256: 33afbc081a76855da22cdaf984fe07985f2500ab4d955c0d80ce8fc6edfb5e78
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings point to the document acting as a link farm, with numerous external URIs, including one on 'nomylo.ru' that appears to be a primary lure. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to redirect users to potentially harmful content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://nomylo.ru/pbw?utm_term=slaughtered+vomit+dolls+movie PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418367/normal_5ff10ff4d8e52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453889/normal_6025a9328520d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391013/normal_603a5fe3e7507.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503617/normal_5ffc39e74d61c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423752/normal_6047c34d2668b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fevosezew.pbworks.com/f/grammar_mastery_test_2_answer_key.pdfIn PDF document text
    • http://wefolevemud.pbworks.com/w/file/fetch/144475284/zujufomik.pdfIn PDF document text
    • http://jorowad.pbworks.com/f/77133385699.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/f/how_to_hack_on_counter_blox_roblox_offensive.pdfIn PDF document text
    • http://lomubel.pbworks.com/w/file/fetch/145103334/45833561700.pdfIn PDF document text
    • http://sujagajo.pbworks.com/f/69615548972.pdfIn PDF document text
    • http://namikikis.pbworks.com/w/file/fetch/144518859/59727254043.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf046b29-4dd3-4b2c-aaa2-edda4a4a57c2/xinelewezedoru.pdfIn PDF document text
    • http://lojefizowoj.pbworks.com/w/file/fetch/144612138/bunuwakovimi.pdfIn PDF document text
    • http://samixexere.pbworks.com/w/file/fetch/145105974/inbev_anheuser_busch_merger_analysis.pdfIn PDF document text
    • http://mizelabe.pbworks.com/w/file/fetch/144906537/filmorago_no_watermark_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0de01fa8-b3fe-4005-8b2f-941e43b2c350/the_little_prince_first_edition_french.pdfIn PDF document text
    • http://vadibun.pbworks.com/f/44455790463.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 5400 bytes
SHA-256: bbe795c95ddd1565eedb6901e0d209849924b877fa4dda5edd19ac87e8c2e934
font_01_sfnt_off0000ef27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 13132 bytes
SHA-256: dd7255a94af4e6b99d6c0050c85661daf39c6669f0fc64cb9e72b9a4b94a3326

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