Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e0ffbb02b2dc2d…

MALICIOUS

PDF

72.1 KB Created: 2020-11-21 09:54:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a0d4a453c1ac70feb9ab5f3f34ac5c61 SHA-1: d6cab95872fe3bbd6dce253c25eccce97f68b981 SHA-256: b1e0ffbb02b2dc2dea62a951195fe0c9cdd76bb0bd693208fc1a988139204610
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-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://traffine.ru/123?utm_term=social+security+office+spokane+valley+wa PDF link annotation
    • https://jomefibid.weebly.com/uploads/1/3/4/5/134596324/7290491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389809/normal_5fa99ff860471.pdfIn PDF document text
    • https://jesokawafaz.weebly.com/uploads/1/3/4/6/134626724/kukutawam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389604/normal_5fa657941f32b.pdfIn PDF document text
    • https://zazetafulunemu.weebly.com/uploads/1/3/4/5/134599809/ronaredutepodow.pdfIn PDF document text
    • https://raxaregos.weebly.com/uploads/1/3/4/3/134363135/fiwodam.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/37abf9a0-125d-45db-ada5-bcdfae2ee83d/jitaxamevebop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/052834b5-6279-45c8-8a83-e86b0ce3b7c4/intolerancia_hereditaria_a_la_fructosa.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/la_spas_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f61d1d60-6b8b-4b75-a7b3-828f3c374040/introduction_to_linear_regression_analysis_5th_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/302ce26d-2cba-4a43-ad1e-00818fe9405d/vobipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7fee88f-7329-4774-8538-30f6a8c62b59/71518073131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97eb636a-321a-4750-8d6c-3b869583e4dc/36683730223.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd3d1952-c50c-4082-810f-105209841fc2/76570048181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c42a39ec-7d5c-44ef-9450-d3ebf2d98160/bowuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2804c67-76fd-45e8-8687-a28779b5d87a/48487394202.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/76337815355.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_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 5428 bytes
SHA-256: a62cd32fd464515806e9ea1f97a03ce11f1aed1cdaa4e223471d4fd35a01e047
font_01_sfnt_off0000ee41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE41 11160 bytes
SHA-256: b8e5f1f670c5b489e73f37d6169f8ee9c735a3c0413031e03935a89130616dea

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