Malicious PDF — malware analysis report

Static analysis result for SHA-256 9503c4cad2cf436e…

MALICIOUS

PDF

80.8 KB Created: 2021-03-19 14:53:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c02391a380047bf53d6bb4a19e7c23f8 SHA-1: 404149f338d4aac4b1907f348ab2fcf6a0763963 SHA-256: 9503c4cad2cf436e08fac66e75ab5f07309798d1a1c28a8ffa5b9a715bc770dc
156 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm and has been flagged by ML classifiers and ClamAV as malicious phishing content. The embedded URL, 'https://jumiwimov.ru/award?keyword=assistant+property+manager+job+description+pdf', is presented as a job description, a common lure for phishing attacks. While no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest malicious intent, likely involving redirection to a phishing site or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/award?keyword=assistant+property+manager+job+description+pdf
    • https://static.s123-cdn-static.com/uploads/4478125/normal_5ff1644b691fc.pdf
    • https://cdn-cms.f-static.net/uploads/4387702/normal_5fd1c10fec6f1.pdf
    • https://cdn-cms.f-static.net/uploads/4424985/normal_5fdaf5e178a70.pdf
    • https://farunigi.weebly.com/uploads/1/3/4/7/134716297/2946617.pdf
    • https://nikulagoronol.weebly.com/uploads/1/3/2/3/132303117/tazuwogame-lurakaso.pdf
    • https://static.s123-cdn-static.com/uploads/4481423/normal_6006234086799.pdf
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/metexiveravos.pdf
    • https://static.s123-cdn-static.com/uploads/4494166/normal_60064444340ad.pdf
    • https://static.s123-cdn-static.com/uploads/4368758/normal_5fc631b611b95.pdf
    • https://cdn-cms.f-static.net/uploads/4376850/normal_5fd66fa212e8c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/40f54115-1483-4e68-baf9-1664749974b4/ejercicios_resueltos_formulacion_quimica_organica_1_bachillerato.pdf
    • https://s3.amazonaws.com/fusidejebi/arithmetic_series_and_sequence_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/d7b084ec-efdb-42bd-956e-fdbd257114fd/walitem.pdf
    • https://uploads.strikinglycdn.com/files/ccab22b7-8bcb-497d-b799-80595d812339/tableau_tutorial_ppt_download.pdf
    • https://s3.amazonaws.com/fonibinaraj/zizawafegipekufonid.pdf
    • https://uploads.strikinglycdn.com/files/62847650-5ef6-43c7-8c2b-d0a86aef5f74/is_the_talmud_a_holy_book.pdf
    • https://uploads.strikinglycdn.com/files/775c0e34-16fd-40fc-91ab-9ec8819b8fd5/wapuzokiburudufofe.pdf
    • https://uploads.strikinglycdn.com/files/8b227880-46b1-42c4-8053-f4b143c406d4/sasabubiximone.pdf
    • https://uploads.strikinglycdn.com/files/d3dd6802-1b4e-4622-948e-c52fd30e7695/what_episode_does_naruto_end_on.pdf
    • https://uploads.strikinglycdn.com/files/c22e3516-69ba-4498-8768-f3a9ec50334e/scansnap_ix500_failed_to_create_a_file.pdf
    • https://uploads.strikinglycdn.com/files/5813e415-3e3d-4a21-a370-e89bfc593cbe/naxeralonizesef.pdf
    • https://s3.amazonaws.com/kudowo/wofikidadewewat.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_off0000f034.bin
ab9663d1dbfde071c09c7877212e66fdcc714f3f77bb7239470df9d97e201bc2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 5540 bytes
font_01_sfnt_off000102f1.bin
bb78a2ec826dd39dbeead0bc1616f6432c456763ff2304fb50e4fea2b08e125b
pdf-font-stream PDF embedded font (sfnt) at offset 0x102F1 10704 bytes
font_02_sfnt_off0001278e.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x1278E 4324 bytes