Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21d1a4ca4d195af…

MALICIOUS

PDF

77.7 KB Created: 2021-05-27 21:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9cb7557ea2e943aa255ae20d54423be1 SHA-1: 3586a641e6a22d7d16fdc0d7ff4e7ce5a0f5bbf0 SHA-256: b21d1a4ca4d195af5225a07cf71ed8dd5a24d26f6b56bb907694ef39b8fe9322
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=pencil+shading+exercises+worksheets+pdf In PDF document text
    • https://gopabaxofusa.weebly.com/uploads/1/3/5/3/135300850/2313ff58a6.pdfIn PDF document text
    • https://nagiwudulowep.weebly.com/uploads/1/3/0/7/130775657/gejedugenokexu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417992/normal_5fd259816d8d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392218/normal_6014bd08535eb.pdfIn PDF document text
    • https://fepiwifir.weebly.com/uploads/1/3/4/6/134676425/balotewilore.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379477/normal_5fde70ee7b539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482617/normal_6034e29a128aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467612/normal_6056c9c605492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463298/normal_60219513ac0c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447464/normal_5ffb401981754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481270/normal_6036a39e587e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483346/normal_603e2c72d385a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409403/normal_6012ed9c69de8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427080/normal_602ece1579320.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375702/normal_600a047d31070.pdfIn PDF document text
    • https://fidimamafiw.weebly.com/uploads/1/3/4/6/134624465/a3dfbc.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/666f4cda-8e4a-41c4-8034-6854fedec019/36441557564.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/080cfa5e-ad39-46a1-a94e-e8a0a63ae092/62677983115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf9c20b8-96a2-485d-a5a8-8578e88cab52/23391575319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1400844-8d36-4502-9c91-ccb982124471/how_to_activate_autocad_2020_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1090b03c-d7b7-4695-b82a-a1e91e3688bc/allister_access_3500_garage_door_opener_manual.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_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 5640 bytes
SHA-256: 4291a0ab705c5e25bf39b7990bb3e4f15a4f013d61e91c6c380afa8cf1bded90
font_01_sfnt_off000102c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C1 11056 bytes
SHA-256: afe9eb9bc324e3a17408c31f9ab3f87155c16e244cfa1f9447c5b9ec3a6f10fd

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