Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5935b7fd54d918c…

MALICIOUS

PDF

76.5 KB Created: 2021-03-27 16:08:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 2b8b3eb8234cae65ab5079fae3021fee SHA-1: 5909bd8b23309b6ba343dc5a4abdc87c53eedca3 SHA-256: c5935b7fd54d918cd48ca218f59d2aaddd412a4f44fbdfcf900d637efd01ac4e
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with a heuristic indicating an external URI. The embedded URL, 'https://dugedepap.ru/award?keyword=payroll+management+system+database+project+pdf', suggests a phishing or social engineering lure related to payroll management. Although no scripts were explicitly extracted, the PDF structure and the presence of an external URI strongly indicate an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/award?keyword=payroll+management+system+database+project+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402721/normal_5fe8ca988343e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403948/normal_5ff5ed4ea6cec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492272/normal_604dcaab83c1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456728/normal_601384cf759cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459028/normal_603f337ea25a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383475/normal_5fccc98bb48b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401538/normal_602e636843ce9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375199/normal_601856a940890.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/indian_beautiful_girl_wallpaper_pictures_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/adb_root_android_device.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba147885-3f70-42de-a867-755c5c50c31a/41295217328.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/what_does_ankle_bracelet_signify.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/gaworarirug.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/82066821920.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/97144473150.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/dibakulerebejumitibalex.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/podepapifo.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/wuvigesakelupemujad.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/angularjs_modal_dialog_templateurl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25d26f9e-b9df-401b-82a3-76af29f7083b/audacity_download_windows_xp.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/java_programming_exercises_with_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8c01bda-ebed-45cc-aa62-5d92cd357b39/algebra_lineal_mejores_libros.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_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 5792 bytes
SHA-256: db07c367e2121de4f0faef522c931e210762cea9594d677975e83cf3436b5e42
font_01_sfnt_off00010310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10310 9764 bytes
SHA-256: 8ddccfc0667c5d5c6d499a4cc54b91e80fe71e56c367122473daa256728d9e93

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