Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63975d8ee06f8ac…

MALICIOUS

PDF

72.3 KB Created: 2021-03-28 00:58:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: fde82b0f83b927668f83da023b3a4d10 SHA-1: 557ef2aee92a6d99638064db9fe304afcb6d8c83 SHA-256: f63975d8ee06f8ac88a9df90fef740921d6663813993e9566a1564d89ac85992
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in link farm or phishing attacks. The primary malicious URL identified is https://nipisod.ru/award?keyword=kabbalah+egipcia+pdf, which is likely part of a phishing or scam campaign. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://nipisod.ru/award?keyword=kabbalah+egipcia+pdf PDF link annotation
    • https://cdn.sqhk.co/zebenane/dwij6ic/action_rpg_pc_games_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370073/normal_602aa5523feff.pdfIn PDF document text
    • https://cdn.sqhk.co/lozukoxokir/g11nidV/11263262279.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/emcagqv/sadovekigadi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369158/normal_5fdc49f744aa2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393521/normal_5fe5facd3e7cb.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/23219281-cfc4-407c-9e35-2b428eae5663/99859156245.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/neil_gaiman_dc_comics_crossword.pdfIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_180716e7db0041b893bb5482472678c8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f24378d-3c45-4691-95c5-c898ef6a9428/how_is_arrow_spine_measured.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c793d731-b9a6-4583-ad49-0a56d66ab499/99277972669.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/is_deskjet_2132_wireless.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b2ee363-9cd2-4834-864f-b8d93e5184fc/tavawogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cc7888d-4e94-4ff6-9d74-82b853ba2b32/buboloxakusafabixim.pdfIn PDF document text
    • https://da6a6a96-7907-4aac-bfe3-592928b14ca9.filesusr.com/ugd/39e844_f26f00e716bd458ca9bf4d015a5440e6.pdf?index=trueIn 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_off0000da81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA81 5252 bytes
SHA-256: 4726db63f32b39812b88fd387dfbde60f7a137000f1d9a5e5ba43d92a5e7f595
font_01_sfnt_off0000ec65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC65 12024 bytes
SHA-256: a04a540a279cf8fdc1b9bf251127c38126445f37f85b248902bcf2bb486eca7a

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