Malicious PDF — malware analysis report

Static analysis result for SHA-256 d042c6c7e4ba6a2c…

MALICIOUS

PDF

66.6 KB Created: 2020-11-13 02:03:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cb26a74068fd5233435d08cae1ed5a3c SHA-1: d8961a07cc50e745f97aa09a42799804e31fd962 SHA-256: d042c6c7e4ba6a2cd2a69636624f1367147bc49e5bb4d52dcf0036e8aa0ce97d
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 0.9998

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://traffine.ru/123?utm_term=roland+grise+middle+school+wilmington PDF link annotation
    • https://reluxepeguru.weebly.com/uploads/1/3/4/3/134363030/3912162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427526/normal_5f981e1899de0.pdfIn PDF document text
    • https://rovumixonisi.weebly.com/uploads/1/3/4/0/134012407/0c3bab3d776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427809/normal_5f9e0bcc31390.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
    • https://uploads.strikinglycdn.com/files/c86af2de-78a0-43bc-a97c-1f36e6957c78/mumuxenetunulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ce718aa-2c7a-4fef-8c20-c111792e4230/wikaburazerol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be3a09d7-518c-4453-b988-3fca5862134e/rizimege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20163f02-0b6e-4957-9b19-c7e039f10091/werudiwaruzaguzovamig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/439658dc-d9ad-4e77-bb61-b6697a26a23f/25269089822.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f39cacac-6f6f-4cd1-a142-1fdbf7a86f20/dream_house_a_novel_by_cutiepiemarzia.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/manorama_year_book_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/zileperoluvuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c2c3d13-0afe-408e-894a-61bbee982972/80234770032.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_off0000ba0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0D 5240 bytes
SHA-256: 5a8f1704a136a0ef827b65a7bf85fa512a2e6c3c1650e98ae08e052f51e23283
font_01_sfnt_off0000cbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC4 10364 bytes
SHA-256: 041bc0ce5543485a48986150efc80e7623bcc77c03d313add8183f304d82aa70
font_02_sfnt_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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