Malicious PDF — malware analysis report

Static analysis result for SHA-256 232ebf6532bc60e5…

MALICIOUS

PDF

75.9 KB Created: 2021-03-23 13:59:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77a4f9b72edda35bb09bbff02625a1a6 SHA-1: bfa1977826d3b60b14e98794a3d5ad9c81a56877 SHA-256: 232ebf6532bc60e589ddfbea8125dc0488b456f9cd31b9d12b10dea5d8c1f4ae
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The primary external URL identified is 'https://pelibifir.ru/award?keyword=performance+appraisal+research+paper+pdf', which is likely part of a scheme to drive traffic or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://pelibifir.ru/award?keyword=performance+appraisal+research+paper+pdf
    • http://doxalasi.mywebcommunity.org/customs_union_russia_kazakhstan_belarus.pdf
    • http://sevagawos.getenjoyment.net/mimikerabo.pdf
    • https://static.s123-cdn-static.com/uploads/4383912/normal_5ffd42ac8933b.pdf
    • http://ninuxalezopo.getenjoyment.net/english_grammar_book_in_gujarati.pdf
    • https://cdn-cms.f-static.net/uploads/4450257/normal_600fb7bdef4fd.pdf
    • https://cdn-cms.f-static.net/uploads/4366041/normal_6016614535094.pdf
    • https://static.s123-cdn-static.com/uploads/4490250/normal_5ffa5ce2882f2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_6618fa928e2940d9b499aae628594205.pdf?index=true
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_7bfe675699634f02845d94a4f8ccfc49.pdf?index=true
    • http://furipurisebete.onlinewebshop.net/abide_with_me_piano.pdf
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_4ecfddffd0164f2ca07a316659d78032.pdf?index=true
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_1f2fc5ba906640cab4f7220a24a43915.pdf?index=true
    • http://suvalomimo.atwebpages.com/bogomunadibosexusu.pdf
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_031eb3093c74406f8110b3c469ac613b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/913c5796-002a-4ae6-aa01-0932144a7998/behringer_1202_specs.pdf
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_be696d23ff9b4dfa8598c05468f822fa.pdf?index=true
    • http://nebojemesiwi.atwebpages.com/38919671517.pdf
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_8a32c798604c4428bd3d39d6dde64c52.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d8c0edfa-8c70-4c59-a2c1-e4fdc7d9a4cb/numerical_methods_with_matlab_implementations_and_applications_gerald_recktenwald.pdf
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_1e45cf7f4a034c6194276b1601df3b17.pdf?index=true
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_e6d3dfd4195c4b9ca6a5104fcc34652c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed4b.bin
9fa8730b4d3e33fb8a1b799d08dacb2791fe6985eaae08a6f3cf99a3d25f1edc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 5396 bytes
font_01_sfnt_off0000ff73.bin
e05606d0f14f08fea4bd250525e8b3dd7d9e9b7ce1b006e452e065da605a01dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF73 10232 bytes

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