Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23e8c2f7254166d…

MALICIOUS

PDF

81.2 KB Created: 2021-04-06 00:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f018ff34dd89ef3665540f0887ba2bf9 SHA-1: 2641953ad04ef859d7bcfb7f37ca73cfabbd5623 SHA-256: f23e8c2f7254166db896d26c761978930f60e93a293c33e4b51baca378daa4e2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are generated and point to PDF files, indicating a link farm or SEO spam tactic. One prominent external URI, 'https://baarspo.ru/strik?utm_term=is+it+normal+to+have+light+pink+spotting+in+early+pregnancy', suggests a phishing or scam attempt by posing a question about pregnancy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=is+it+normal+to+have+light+pink+spotting+in+early+pregnancy PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_f8e032619c22402b86ac1fb04d3b8913.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/76234431588.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9737ca11-29c7-4711-ad58-3bdd1ce81402/28318450117.pdfIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_2382ce49427649cb9b7ecf41f43eda9c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/83564432440.pdfIn PDF document text
    • https://77a5c3e7-429a-4f60-ad30-886abaef4f6e.filesusr.com/ugd/07a1ab_3dfca5ceb7884f2ba0b16661d294de87.pdf?index=trueIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_d33f1539ea954a0daf6f58776053b520.pdf?index=trueIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_1daa8d1e18ce4a36a5f9146d082c8195.pdf?index=trueIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_6153a30b41f8424bb6cdfa921c65f51b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/befafuni/27889616649.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/jebofawe.pdfIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_35424646ad36449da6bb23b28f18ffa2.pdf?index=trueIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_7a3f3fccfeb846b29749a6e4d6a2324f.pdf?index=trueIn PDF document text
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_9e9c84e1efab44db829c86f7a4593da2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef1a6803-482a-49c7-ab28-4f9c65ca7bc2/49876485338.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/7.3_powerstroke_mishimoto_transmission_cooler.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/el_alquimista_audiolibro_completo_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3905e465-aead-493a-a25e-6fabeaa3f07c/ficciones_borges_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8277ef7f-35cf-4d36-9c91-032126385b11/13775829020.pdfIn PDF document text
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_636bb069e7104382b0feaca8f968d8e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xetasif/chota_bheem_boat_race_game_free.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_off0000fd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD95 5512 bytes
SHA-256: b7f4d793dfc8529e62c03061be80aeb0aeee565eee1575ac081f6915f0fdf13d
font_01_sfnt_off00011033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11033 10820 bytes
SHA-256: e5b3782b10a0a3806bde469b8c6027042303a5be981d02f50175d6bacd23c5f5

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