Malicious PDF — malware analysis report

Static analysis result for SHA-256 552a861d08dccc17…

MALICIOUS

PDF

74.9 KB Created: 2021-06-03 07:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 144a40d68ba3b2b2407aebf88a13786d SHA-1: b428fd618a40cba9ff2e7d01ab339f79bcfdf57b SHA-256: 552a861d08dccc175f754a6e6fe01a1941feda0fac12656473711f112aba5b09
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for an external URI pointing to 'midufefew.ru', which is suspicious. The document body, though heavily obfuscated, contains text related to 'Game badminton league mod apk revdl', suggesting a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/123?utm_term=game+badminton+league+mod+apk+revdl PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4415052/normal_60b2173372dd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421217/normal_5fdaaca5120ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450152/normal_601c947875f4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472506/normal_60243d4f9636d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470537/normal_5fdbe12375a0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485322/normal_60394c2e7f840.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461495/normal_5fccbb0b9df0a.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4464527/normal_60afffe47d089.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446772/normal_5ff4c226e1242.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a00bb65-7713-43b7-a5b7-0182d6f673f4/how_to_become_a_resume_writer_on_linkedin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b6699fd-c9e4-4b11-9374-956a12826699/zazowababadogidetazib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/334d395e-b2dd-4671-8075-e9139a430a79/how_to_make_chicken_tortilla_soup_slow_cooker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/160ac6e2-825e-45c7-a5b8-db891fea553c/78473677341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c8e8c1d-752b-4ae1-98b3-45bd7fa01d6a/an_atom_has_3_valence_electrons_and_4_occupied_main_energy_levels.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b2eaea7-7370-4d3f-a756-336e15006f6b/reromozukuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c61ccf40-4b8d-4231-a5b4-6a71f02f6799/allegiant_2016_full_movie_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a759c87f-c612-48a4-ba91-6c61b1033abb/franny_and_zooey_summary.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_off0000e90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90A 5396 bytes
SHA-256: 2095a0d9d67add69808a4ef89245ff195258b68e7b3b4e4d9f64c442eeb3b49d
font_01_sfnt_off0000fb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB54 10312 bytes
SHA-256: d16b4f4de29c9579015db83ef41fc8c29c81f7e10c1aea6e6e60eefa1dfee1d0

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