Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b251793f6c78aca…

MALICIOUS

PDF

84.4 KB Created: 2021-03-26 08:10:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f1c7c47a4661ec729e2ca4283028399 SHA-1: 1870c2afe1e3aad609b5a9061cd872c04e14f5cb SHA-256: 7b251793f6c78aca13ff0a0c0058916e310312661771f969fd64a79fa1059ab7
104 Risk Score

Malware Insights

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

The PDF contains an embedded URL that is flagged as malicious and is associated with a phishing lure, as indicated by the 'SE_INVOICE_LURE' heuristic. The ML classifier also strongly flags this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and the presence of an external URI suggest an attempt to redirect the user to a malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://gimoguvi.ru/award?keyword=ibc+amendment+2020+bill+pdf
    • https://cdn-cms.f-static.net/uploads/4426059/normal_600efccff1e92.pdf
    • http://jikusofare.mywebcommunity.org/split_file_free_software_download.pdf
    • https://cdn-cms.f-static.net/uploads/4371247/normal_603f7efe23999.pdf
    • http://sokixatov.mywebcommunity.org/where_to_buy_kidde_smoke_and_carbon_monoxide_alarm_in_canada.pdf
    • https://static.s123-cdn-static.com/uploads/4457563/normal_6005734c1bbd4.pdf
    • https://static.s123-cdn-static.com/uploads/4486523/normal_5fe19b1949f6b.pdf
    • http://ninijefaligogi.mygamesonline.org/24619717652.pdf
    • http://lolafoduluj.22web.org/godogulodozakubuz.pdf
    • https://cdn-cms.f-static.net/uploads/4376602/normal_601f2d9bd90e8.pdf
    • http://vulewonatetil.22web.org/how_to_write_an_essay_in_mla_format_google_docs.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jidosatikim/part_time_night_shift_jobs_las_vegas.pdf
    • http://newitipalude.rf.gd/aspen_hysys_7._3_tutorial.pdf
    • https://uploads.strikinglycdn.com/files/40da6cf1-8bea-461f-9882-24e9ba960877/kumon_4th_grade_math_worksheets.pdf
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_7185ddfad0554dd081dfbd9639b07419.pdf?index=true
    • https://s3.amazonaws.com/lunojol/aalavandhan_tamil_full_movie_single_part.pdf
    • http://metoduzudo.rf.gd/information_technology_consultant_cover_letter.pdf
    • https://uploads.strikinglycdn.com/files/c6a53915-64b6-470a-9963-569f29ff8b11/14904266454.pdf
    • https://s3.amazonaws.com/pegebunov/zuwogobutajiwute.pdf
    • https://1b29d73f-e60a-4823-8499-00e25b64e02e.filesusr.com/ugd/e54fc7_fc7c3c7237e54807b77a278f7749a7ed.pdf?index=true
    • https://bbaef297-c986-4b42-acb3-0fd65605e280.filesusr.com/ugd/e9fc71_d99af3041194487ebecbd9473de74ce0.pdf?index=true
    • https://s3.amazonaws.com/lixasifasi/lazogapirazetorelinuli.pdf
    • https://s3.amazonaws.com/bomifabipi/55151699775.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_off000100b9.bin
5c8d42ecf6440db88864e87ade4b776054200a27fe2b031dd7430179c92153e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100B9 5056 bytes
font_01_sfnt_off000111cb.bin
1d0194c535e9694f1bc786ffa5b4e0ed8053b696b0239d39582605de75763ee8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111CB 10748 bytes
font_02_sfnt_off00013668.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13668 4324 bytes

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