Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a0318d00f5a0dc…

MALICIOUS

PDF

64.1 KB Created: 2021-05-30 07:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ac57a045cdddcf6d0c8768796f79d5b5 SHA-1: 713c22ef5b0118d2cf128215dfddd42b1780c2f4 SHA-256: 87a0318d00f5a0dc2a6cac7a46b97d9f97608df9293ddee212c4ff57befebf27
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 0.9996

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://gimoguvi.ru/123?utm_term=caution+signs++free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378856/normal_6059b694af1d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451941/normal_605b58232247e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386848/normal_601abaaa75426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489734/normal_603a942bab89b.pdfIn PDF document text
    • https://xabifiwalutoku.weebly.com/uploads/1/3/6/0/136085939/e7e0ce38d8b7.pdfIn PDF document text
    • https://lenovajujibina.weebly.com/uploads/1/3/4/8/134875160/ad9d3b9b5aea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496204/normal_5fc80b80b9aa7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495395/normal_601a09f8d49c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475570/normal_5ff2b02b821a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389084/normal_601f53589f1a3.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/8b58c97a-aa98-4b83-a2c1-297ae6cd9c7d/40293995198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8e5fbe0-e939-4870-9dcf-ca41315a3a76/14012095503.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d1b9f6e-a608-4b18-9bab-93c0af688301/rinaxurukusug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30c48f1c-c981-4a07-8cac-533c67a6bce2/lg_tv_codes_for_att_uverse_remote_control.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/445ab830-db97-4b5f-8050-50f65c3235c1/8304530756.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccb4f57c-c6a6-48f5-b0aa-46c821c2b826/24328106388.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01a9fee8-4966-4a18-91a1-4017da79f2c1/12727172854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ce55470-1e1d-4fe8-86c3-c7c014553c68/nagibetisip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee76249f-e473-4dc1-a70e-21f7328a54c2/17698433784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc430e2a-19b8-4ef9-92b3-fa151dd9f1b8/10431644672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1908bcaf-e966-4e87-954c-70df9c47c40f/48798246793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78519fb6-109f-4b81-a894-d971d6cdb0e9/lexus_ls_460_lease_deals.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_off0000c1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EF 4808 bytes
SHA-256: f7eb4d323bff6564fd8a95eabf28a94fbd26fc72e606952cfe9a33985a36f371
font_01_sfnt_off0000d256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD256 9680 bytes
SHA-256: 78fe2fea5f212c33be827b51a8cbf8542a9583f33ad7687756e80229e4c6dd61

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