Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87140a92d0d5887…

MALICIOUS

PDF

72.4 KB Created: 2021-05-22 20:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: de04d1ce695c6585d215d5d2759379c8 SHA-1: 66968d5ac3bf6d4676b2289ba21f4bb30414b7be SHA-256: f87140a92d0d5887c25b0bf78a4f311d765272575bc24b9b50da9110a94f08a0
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URL that mimics a legitimate resource for CISSP practice questions, suggesting a phishing or social engineering lure. The presence of embedded JavaScript, although not fully detailed, indicates potential for malicious scripting to execute.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/strik?utm_term=cissp+practice+questions+exam+cram+4th+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417145/normal_603977e04de41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452377/normal_601309adeea62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468531/normal_6026e62be76d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369783/normal_60550fe01855f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367300/normal_6050c40c5a32c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489402/normal_5ff6b0fec6ecf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378157/normal_5fd7ac7b9fbe9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390366/normal_5fe60dc81ea76.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/d7dff347-cd54-4d7c-87c4-735bb68703f5/dometic_8500_awning_parts_breakdown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2300feb2-c995-4e2b-a478-6b66c329f870/budawokik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80edb452-9279-42ee-b7e6-44f31edcc953/95234456080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc85ea1-b11b-4447-922b-ff0404393cbc/buribav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3973486-cf42-4cdf-807c-940e15c7a1a4/how_to_amend_a_trust_in_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/328628ae-2797-41bf-8ea7-cef4ef1b9b91/is_ww_scale_accurate.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/khan_academy_sat_prep_test_2_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/pretty_little_liars_season_4_episode_14_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e4c8aec-8373-4ef4-adee-e5ac6bdba03f/kuwowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e919f2b1-5a14-4a81-b391-c8c70b2e1177/fatejikuruse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2210bf6-4e44-45ca-b33a-aae9262ae777/sobopefivajejibopev.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/how_to_reset_airbag_light_on_2008_chevy_silverado.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/classical_guitar_teacher_houston.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/18425785386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/771d746e-8f37-4be7-bd33-9f2ec477eb36/download_visual_basic_for_applications_windows_10.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_off0000dcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF7 5548 bytes
SHA-256: c15225c0fe094a86d68115b753fad8918875a8fb5d3f84feef2605d45224c1c8
font_01_sfnt_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 10788 bytes
SHA-256: 1759daaf78de88c81d3fcc56954f359570a6e154baba7dea716dca0dc67dc701

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