Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a8252f68c2c02f…

MALICIOUS

PDF

148.5 KB Created: 2021-05-10 03:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 24cd9d2edda327e2fdbd0f8d00eed1e4 SHA-1: b1fc1b4c539026ae4529b0adf4ba08b1b685b6cb SHA-256: 15a8252f68c2c02fb85d5c1dbb68accf7ebcc979915d2f507b9f5673de087664
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI that redirects to a suspicious domain, likely intended to lure the user to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to song lyrics, further supporting a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://zajinet.ru/strik?utm_term=we+did+it+when+we+were+young+lyrics+meaning PDF link annotation
    • https://cdn.sqhk.co/fupokonabat/jibgcdO/vavibibojokitalo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460694/normal_5fd739a52fb25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_6025e4452422e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447270/normal_5fed5fe8de94e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407804/normal_5fd11c5a530aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478928/normal_600976d1704bf.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/KjeiigG/dream_girlfriend_apk_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403557/normal_6015fc4259985.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_60150a646d984.pdfIn PDF document text
    • https://cdn.sqhk.co/kujotukil/zggcXii/airline_tycoon_evolution_cheats.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499979/normal_60126407cddfd.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://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_cdd948618d0240009e864506d08bd015.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukujidor/examples_of_matrix_and_functional_organizational_structure.pdfIn PDF document text
    • https://c335e157-9962-4e43-983a-f5fcf491c4e2.filesusr.com/ugd/a09b09_5f0558573756425ab4a6ffd64ea7ce32.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/new_bengali_film_song_2018.pdfIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_1bd0c2dc78e54b6ead5983e1a62cf50f.pdf?index=trueIn PDF document text
    • https://0ac950e2-707a-4e47-8bf4-daface0ea9db.filesusr.com/ugd/356f11_f8ba2818b7974357a7137a0e115cf23e.pdf?index=trueIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_4325642c456f47c69ac62d15e09765b5.pdf?index=trueIn PDF document text
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_999c3156750a4305bcf7884f0071baaa.pdf?index=trueIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_a80fed0f82a148a98802c4847ef7e599.pdf?index=trueIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_ba3a3570ce0e4bfbbe7320f03f463139.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D45E 5444 bytes
SHA-256: 16b4d1dd1c9399758b749895f860c86848c705f7fa48e81752f1c2424c8d15a8
font_01_sfnt_off0001e6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6C5 20012 bytes
SHA-256: 74fdb6a7333e58c13712e090bf19490820ba78bad1cd07ff56a1610952f5d50c
font_02_sfnt_off00022046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22046 16148 bytes
SHA-256: f3477b1951101a34bce42dbe9ef7dbe73c051869de09f35031457e77a8862942
font_03_sfnt_off00023548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23548 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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