Malicious PDF — malware analysis report

Static analysis result for SHA-256 5093636de1e4dd54…

MALICIOUS

PDF

76.3 KB Created: 2021-03-30 09:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebf4ab1215c322aef33c822023ad7d1e SHA-1: eb58922df67c2296b4d1b6018f90244316860dc4 SHA-256: 5093636de1e4dd5408279a8c5e20c139902e73f17ff91581dc46a7f8f4e765a8
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that mimics a search result for a psychology textbook, likely as a lure. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The presence of an external URI points to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/award?keyword=abnormal+psychology+by+david+barlow+pdf
    • http://kiwalapisetovu.iblogger.org/which_colour_is_best_for_day_function.pdf
    • http://gudoteli.22web.org/ceiling_design_for_living_room.pdf
    • https://cdn-cms.f-static.net/uploads/4380088/normal_60435e23d0961.pdf
    • https://cdn-cms.f-static.net/uploads/4447252/normal_6046f70555bbc.pdf
    • https://cdn-cms.f-static.net/uploads/4415292/normal_5fe9f5afe7ff1.pdf
    • http://naturagrush.space/genel_matematik_1_murat_gzeltepe_pdjxg5u.pdf
    • http://hellochildren.online/afghan_jalebi_video_songh3aqb.pdf
    • http://tokio-2020.fun/28945365838465om.pdf
    • http://clientesdkb.com/52919515393izw61.pdf
    • http://tixshopclub.fun/sample_demand_letter_to_general_contractormjkbb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pidawuz.epizy.com/35096063810.pdf
    • https://s3.amazonaws.com/viregujipowuru/panasonic_tc-p42x1_specs.pdf
    • https://s3.amazonaws.com/bomupi/lunogegafa.pdf
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_6d678355554c41b9b0086ccebc4a3f52.pdf?index=true
    • https://s3.amazonaws.com/wufujudisu/humiliates_crossword_puzzle_answer.pdf
    • http://fedaposadado.rf.gd/34308132981.pdf
    • https://52f9d6e5-2fd5-4906-a030-4d12f703b62a.filesusr.com/ugd/297ecd_65d1734b2b39494db9ddc000c1260884.pdf?index=true
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_51dce67b505344e4901e740d3b50229c.pdf?index=true
    • https://s3.amazonaws.com/jiguwuzobozobaz/acrylic_sheet_supplier_in_bhosari.pdf
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_b08d2d4032af4c5da465a7bef1031b26.pdf?index=true
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_206399b4af4e4ce6a2be4ef5b28f42d4.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_off0000e9a2.bin
e6e587faf2ca50cb26165b9890b0320eb9d0195b85a33c9243f40161e835b43d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 5952 bytes
font_01_sfnt_off0000fdd0.bin
e6be0442c5756a9d95a0b90cbf36c8280511d00aa23f6d259dc9a11d1dfcee78
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD0 11252 bytes