Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc48f25cf396b11…

MALICIOUS

PDF

82.2 KB Created: 2021-04-06 00:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c59d77b7fb11e0a574ea14b3718ac488 SHA-1: e6c0d812f27bffb3b60039d27a97f8564654febe SHA-256: ffc48f25cf396b11c3b8e85b96a2e0e319e5c50bf54476a2eb2d4ba042d32ed7
96 Risk Score

Malware Insights

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

The PDF document contains an embedded URI pointing to a malicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, suggests a lure related to an 'answer key', likely intended to trick users into visiting the malicious URL for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/wix?keyword=gizmo+plate+tectonics+answer+key
    • http://dietnatur.fun/esna_nut_torque5pwzj.pdf
    • http://lisifakus.66ghz.com/44036085268.pdf
    • http://devgm.design/74675742769vklvf.pdf
    • http://zozagibewaxi.iblogger.org/bpmn_2._0_espaol.pdf
    • http://neo-tp.ru/unsecured_notes_payable_on_balance_sheet7gu5p.pdf
    • http://electorat.org/photoshop_tutorials_youtube_in_telugudogo6.pdf
    • https://cdn-cms.f-static.net/uploads/4378382/normal_60289fe6005a3.pdf
    • https://static.s123-cdn-static.com/uploads/4410418/normal_5ff964e718b08.pdf
    • https://cdn-cms.f-static.net/uploads/4385862/normal_602b8c1e3288a.pdf
    • https://cdn-cms.f-static.net/uploads/4503197/normal_604504eb36cf3.pdf
    • http://auto-agents.space/here_we_go_round_the_mulberry_bush_traffic7h62l.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/7c07d115-917b-466e-8c68-07818a86f0c6/jvc_super_vhs_camcorder_tapes.pdf
    • http://vininotubosom.epizy.com/delopidov.pdf
    • https://uploads.strikinglycdn.com/files/7e295d8d-78f7-4356-9762-91ee08aba02b/printable_gold_card_application_harris_county_spanish.pdf
    • https://uploads.strikinglycdn.com/files/27d548dc-ef03-4311-8fa1-8d4e0100e179/super_mario_galaxy_piano_sheet_music.pdf
    • http://fobugasa.rf.gd/6054287346.pdf
    • http://daxokefi.epizy.com/agreement_form_between_two_companies.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f436.bin
76cf7cf7b993f11be27bfb765b70265bf40f2d2dec311b2d2e65f69064802aa4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 5204 bytes
font_01_sfnt_off000105ee.bin
352bf9488acb6087120089bbfac7e96e8dee264c6798fd2a9423bd99806417b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x105EE 11932 bytes
font_02_sfnt_off00012de3.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE3 4324 bytes