Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b53241ea22b0534…

MALICIOUS

PDF

129.8 KB Created: 2021-03-23 01:42:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 537513b22c866d19adad4da8deea1585 SHA-1: 07e231f62046cbf5486a75289feaa3f4fc4bec74 SHA-256: 3b53241ea22b0534ef32f3c083e2ef662550f10aa5f75b7654b164901ecfe125
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/wix?keyword=false+gods+eichmann+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386094/normal_5fe909d38ae04.pdfIn PDF document text
    • https://cdn.sqhk.co/vurifozi/awUehiR/mobile_denali_fcu.pdfIn PDF document text
    • http://creditactive.info/19204123989bq5eg.pdfIn PDF document text
    • https://cdn.sqhk.co/jilijibimi/hjUhcyz/36536938516.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449630/normal_5fffbd36525d8.pdfIn PDF document text
    • http://lnstagram-helping.live/what_is_the_best_real_estate_brokerage_firm_for_beginnerspo5mu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464996/normal_5fe2498d93c1f.pdfIn PDF document text
    • http://islemleriniz.org/lenovo_ideapad_duet_chromebook_za6f_128gbj3h8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490930/normal_6015163159a1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412575/normal_605570acd4ade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425515/normal_60450d0849871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446394/normal_60261a2d66942.pdfIn PDF document text
    • http://storedubai.shop/bandeya_hd_song_free4d5h5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496582/normal_6000f5daf316b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444371/normal_5fe0f2ac52a69.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_1d06d2ff0f484471970c31a55e4a9d32.pdf?index=trueIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_441e55f5b6e147f7a553f53766967234.pdf?index=trueIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_8f53259e2a5b41cd898b88644dab58f4.pdf?index=trueIn PDF document text
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_1c10ca0217ce4aacb10c59accd0a3675.pdf?index=trueIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_51d57f80bd7146439832bf23961deb97.pdf?index=trueIn PDF document text
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_c3ad4ccfe9a14153bb27a96cf800f36c.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bf76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF76 5428 bytes
SHA-256: 9a4f108e646b193bb7667e4277704282d06d2b7a5c50b78c8941002da4600cad
font_01_sfnt_off0001d1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1C9 13012 bytes
SHA-256: 82c92a723f4b624e05e2c02e4188f8842b58c60297ce12859f50929d4c7155c0

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