Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ec2b0adaec8afc…

MALICIOUS

PDF

63.3 KB Created: 2020-11-24 06:41:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cf276eec6d5b679d7789346faf046fba SHA-1: 9140f7aefb217d5290ce70878b47fd25d16e8cfb SHA-256: 85ec2b0adaec8afc1afb22a89c91d4692ec77889654dbecc18722369104fa151
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://trafffi.ru/aws?utm_term=mathrubhumi+calendar+2018+december+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384640/normal_5fb4b7ab8bce0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392207/normal_5f945b0d1461c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372753/normal_5f93e6312f039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370541/normal_5f97fbc624bc9.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/fiwoligerepab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_5fa3f2a626042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375514/normal_5fb77577477a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366336/normal_5f8c4f9b99938.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/e143dc02-7731-4154-b50a-8de46202e2e5/tozavole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0df9003b-8e0d-49fb-90fc-9e39109f1078/zaromesoruw.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/37554502270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2450df09-480e-4e5b-bb10-f8e98533ecc2/23184541887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4bf0a32-bba2-4b2d-8a63-22bc1b8ac7c2/berinobuxusalazanudes.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/nosud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7520cdc-fb57-4690-8759-560dfda25285/wasetosanuwerarafagik.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_off0000b932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB932 5884 bytes
SHA-256: ac34dbb7342f502979cae804045636494e7ccc1b395df332743aea67578dd02f
font_01_sfnt_off0000cd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1C 10316 bytes
SHA-256: 6af1a1857b4cf12e4a44c4d00eb0a020d687ec7780fdb5f95c781dc25e3cf15d

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