Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bbf17a3b715b8cb…

MALICIOUS

PDF

75.6 KB Created: 2021-05-28 03:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ef11aebc1dbba87e2b3fb81d90abeeed SHA-1: e614192494fcb3799c8040e040ad4f35a30d7b51 SHA-256: 2bbf17a3b715b8cb0f12e824d58bda067401ed7748f3c4827cc0bd29ffbd6913
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 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://resalured.ru/strik?utm_term=how+to+unlock+frp+samsung+s8+plus PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379719/normal_606b7783a11b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382003/normal_601fab186bbf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416918/normal_605e02fe9e8c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479439/normal_6045e9b3b239b.pdfIn PDF document text
    • https://siwevobone.weebly.com/uploads/1/3/5/3/135317475/024f61d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485702/normal_5fd7dad67540a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488116/normal_60315a649c98e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450047/normal_60568b5029319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448740/normal_5fe7f741d683e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409610/normal_6062c0e553335.pdfIn PDF document text
    • https://jazejuvo.weebly.com/uploads/1/3/4/4/134439384/1784975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501991/normal_6031f4647b2f8.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4482860/normal_60b0082924e68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486206/normal_60513c7e07a08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474978/normal_5fc6c320ab26e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381085/normal_6048766b1aa0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461791/normal_6034dffce3782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446395/normal_606de7daa5139.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487927/normal_6059e39285670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469105/normal_60508deea5ca5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452152/normal_603716fdf0960.pdfIn PDF document text
    • https://suzujiwome.weebly.com/uploads/1/3/0/7/130776055/7771170.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488581/normal_600c9013b95e6.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/2956eba5-73d0-41e6-9eeb-064f93d3e790/alimentos_que_no_tem_carboidratos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e17d6a1-c550-4eb3-afe9-3c8220082956/38907058530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c015b4b1-76ee-4c3a-b78a-01e4dba4eabe/royal_oak_bell_office_table.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_off0000e82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82D 5648 bytes
SHA-256: da55c679b6049862e5c269d0b6e89d37bfb8698701d1de59d649620e48d91cfb
font_01_sfnt_off0000fb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB61 11000 bytes
SHA-256: c5021ad8d014bcdaf7fea75daec2cfc2eb831f32f6b709646cf4d9386b2a2229

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