Malicious PDF — malware analysis report

Static analysis result for SHA-256 374b0dc075137b48…

MALICIOUS

PDF

75.8 KB Created: 2021-03-27 11:43:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2be2732ab2db73525b3d14065d3b2664 SHA-1: 8cd356ced3a862ed186a0157fdde6417f415fc2c SHA-256: 374b0dc075137b48717d9dbec1366d186f48d785bcdcdcf9f79e52e28d1a1f0e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=bike+race+hack+apk+7.+7.+7 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471484/normal_6045091744c54.pdfIn PDF document text
    • http://wikuseweluwi.iblogger.org/40629131838.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421615/normal_5fcd63986abe7.pdfIn PDF document text
    • http://zofapojofiwifi.iblogger.org/pecb_certified_iso_iec_27001_lead_implementer.pdfIn PDF document text
    • http://dapunajav.22web.org/ace_test.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470389/normal_600f73f745d4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462038/normal_5febffca1feb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450728/normal_6035dd175abd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466673/normal_603015c0e3204.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444875/normal_5fe553b5e4201.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_2c9c4c088b2a44b19c27af8ec10b77e8.pdf?index=trueIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_c35a88a00a7147a798f283ce4a7ef1aa.pdf?index=trueIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_32a0a61664b54885bf1ef549af3ea404.pdf?index=trueIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_a5bc890d5dc641678c01b2bebc0a883b.pdf?index=trueIn PDF document text
    • http://vonimamodiji.rf.gd/26367088648.pdfIn PDF document text
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_47ff9639d0714da589caa5177050cdf3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/daniwodug/94975353402.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/69247416688.pdfIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_9c6f94a32baa428a9f6488f24bbf60a3.pdf?index=trueIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_aa94d24a43e14885bf37c636a4f2f727.pdf?index=trueIn PDF document text
    • http://xizanisud.epizy.com/carpentier_s_reconstructive_valve_surgery.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/xuvunun.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_off0000ead5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD5 5036 bytes
SHA-256: bfe754fffaac704d266766ff77900932dbc1f4167c7563bdc427e2c97b034a30
font_01_sfnt_off0000fc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC00 11032 bytes
SHA-256: ea0e640182b0510d028941652f02c02c4888f9c3b75d08ccb998c74b1ee75a3a

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