Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5aa474fe5cccad…

MALICIOUS

PDF

85.2 KB Created: 2021-03-06 20:32:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ab39409f46128bbf273c5142858aa50c SHA-1: 1baa741c1d16b4cde0b8c1f594c2f007cf2c5134 SHA-256: 3b5aa474fe5cccadbf1445cfd387227a7cf3aa108be658e8fb56370b8035d136
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 0.9995

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://nipisod.ru/strik?utm_term=living+religions+7th+edition+pdf PDF link annotation
    • http://belugol.22web.org/15748151262.pdfIn PDF document text
    • http://piguzipudoval.iblogger.org/21499315376.pdfIn PDF document text
    • http://expo-kit.ru/robert_henderson_courts_of_heaven_download9gpl6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487622/normal_60316996d7f12.pdfIn PDF document text
    • http://getfreecreditreport.info/953186713551xnpv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481527/normal_6037a3eb25682.pdfIn PDF document text
    • http://bupetud.xyz/978435925iatl0.pdfIn PDF document text
    • http://car-test.pro/block_craft_mod_apk_unlimited_blocksugqt4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445564/normal_5fdad83783ca8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470523/normal_603100012d7b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479441/normal_602d81bfcaa83.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://misopipe.rf.gd/paretij.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/building_houses_games_free.pdfIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_47bbf3bbfdb246ff951aca972f41c214.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/vefafetonoz.pdfIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_f15757c03ac04e4a9ff5e5eff74cba3f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/punurum/ralepir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f08171b0-d346-44fb-a52d-75eadfa89967/brother_mfc-7340_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/69563793754.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/5226492303.pdfIn PDF document text
    • https://849bdae7-2456-4570-9e2a-fc769e7e49ad.filesusr.com/ugd/2074c9_75d71c5500da45b4bc9e71c740067fe8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/67a27e07-c6c7-40d2-b27a-9ccf31501d06/87548865478.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E7 4964 bytes
SHA-256: 13b38b2d119925ff47f118b92058a775c1be51e87bc75d337e0082827c449c78
font_01_sfnt_off000114d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D2 10696 bytes
SHA-256: 596666fd1c429115c3afb932ba54f301a6de031b5b7f0a23ed41c0f33cd249d6
font_02_sfnt_off000138ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EE 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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