Malicious PDF — malware analysis report

Static analysis result for SHA-256 81423587dfb5827a…

MALICIOUS

PDF

42.6 KB Created: 2020-11-01 06:21:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: caa773f799c5292bca503b0ecc8bc900 SHA-1: de287a5b65d1b7db10b00e65520eb14b1fb41e75 SHA-256: 81423587dfb5827adcfdc8f7fb4f89efd3294c741fd73db2a27e08588d06229e
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by 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 1.0000

Heuristics 4

  • 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://cctraff.ru/aws?keyword=explain+how+independent+assortment+occurs+in+cells+and+explain+its+importance.+brainly In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366344/normal_5f912478d3b20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_5f8ce3d79cf7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f8a07a40a6d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_5f920cceee088.pdfIn PDF document text
    • https://vevejeda.weebly.com/uploads/1/3/0/7/130776099/f3bb5cc2ac1ef9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427795/normal_5f9851b04e60f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_5f891849d6e74.pdfIn PDF document text
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/vaburefuvexuve-tumizesalulow-bevimumutu-wipomevaz.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/fb7540e0-84ee-47a3-bcec-54b18c7cfce1/35832368943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebf1decb-b352-4aa4-abf7-ee74f7b721ed/xulavonekezexirojafogi.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/kiketipugojege.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/nejewawogisube.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/vista_del_campo_norte_parking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b06878b7-36a5-457c-841a-9741de722228/5332252061.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_off00006684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6684 5704 bytes
SHA-256: 11fab8dc74b5cd124dba5ff072ea61b2fa271016eb5cbe806f0cc0d39d4d891c
font_01_sfnt_off000079dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79DC 10080 bytes
SHA-256: f9154f3245e1f99444628c6eae9df936ac73e922a4c388ceab054323a7e94d68

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