Malicious PDF — malware analysis report

Static analysis result for SHA-256 23087f0d92a85a3b…

MALICIOUS

PDF

106.1 KB Created: 2021-03-08 14:45:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f9dcf16bd256386df02040dc9647a058 SHA-1: 5e17c62cac33e7d5ab0adb9773a59d7d55712d4a SHA-256: 23087f0d92a85a3be5597fd471bef495f55f3534a9e0d05d207c4f4a9395bc6b
186 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 0.9976

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/wix?keyword=anime+hayao+miyazaki PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404523/normal_6018afd8da490.pdfIn PDF document text
    • http://leafester.online/evangeline_poem_excerpttvqbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500450/normal_60071446cc915.pdfIn PDF document text
    • https://romenugerod.weebly.com/uploads/1/3/5/3/135317494/nosip.pdfIn PDF document text
    • https://zoriliwusitilo.weebly.com/uploads/1/3/4/4/134479822/7833824.pdfIn PDF document text
    • https://nenojidadexodu.weebly.com/uploads/1/3/4/3/134351563/7988641.pdfIn PDF document text
    • https://wufodiwefoveve.weebly.com/uploads/1/3/4/8/134891768/mimosalomawiluj_dekoboguragasun.pdfIn PDF document text
    • https://bagopilijesab.weebly.com/uploads/1/3/1/4/131438775/jolarolisevoj.pdfIn PDF document text
    • https://fukagopesuzidad.weebly.com/uploads/1/3/1/3/131381553/c6b8b143.pdfIn PDF document text
    • https://xisevulatunetu.weebly.com/uploads/1/3/4/5/134595014/4e2d5977d.pdfIn PDF document text
    • https://rirenumu.weebly.com/uploads/1/3/4/8/134884077/nuganimigo.pdfIn PDF document text
    • https://sedeberelaniku.weebly.com/uploads/1/3/6/0/136030724/773197.pdfIn PDF document text
    • http://iglivesupportteam.com/mezamedixijedudebuw74i4v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370768/normal_5fdcf8e1b45af.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://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_d2cb1f3d9495433e9a96613b27bcc9f4.pdf?index=trueIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_d238b3762c4b4f6f9f5bb06c66f2fa91.pdf?index=trueIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_9b6870b68d3746f4992f42d5bf16a1cc.pdf?index=trueIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_b22410cd6efd49f7a6345eb47dd73897.pdf?index=trueIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_68edde50ece24c818f82313bb9062b42.pdf?index=trueIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_de23fd7a5f1b420d8e83e6eca71ed82a.pdf?index=trueIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_0ff24a23fab94c45b405466b4e50b3a4.pdf?index=trueIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_eb8f1b85115d4e48a7bdc2d8610cd8ee.pdf?index=trueIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_13f972b696e54766949f95bca016032a.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001226f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226F 16276 bytes
SHA-256: 4ae04149ad910ea675c3833c608c1297910472d7f1f6e23e8be232d549528275
font_01_sfnt_off00015735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15735 4532 bytes
SHA-256: 1878d39d8fe3759799a4cb87a821e330ce9f7dd51f65a1464773d00e4d7ccbf7
font_02_sfnt_off00016663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16663 10644 bytes
SHA-256: f7cfaaa987c508806a7be64dc1278f9901f6d50a98a9c2a35e42c183388dcf54
font_03_sfnt_off00018ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AE0 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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