Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f534d1c0ccd8230…

MALICIOUS

PDF

63.5 KB Created: 2020-11-14 03:52:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cb7b355eb5e47af63cbb06a7e078ebdb SHA-1: bbb5eea8429a49da338a2f05302e2320c6c2e1c7 SHA-256: 3f534d1c0ccd8230834b967b532d8496438ea8047a606379743a216260ba84af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a phishing or traffic-generation scheme. The embedded URLs point to domains that are likely part of this link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classified as phishing and trojan activity.

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://trafffe.ru/strik?utm_term=patrones+basicos+de+movimiento+en+educacion+fisica PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380219/normal_5f92566bcbc14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370090/normal_5f8eaed24ad88.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/pabetutila.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386073/normal_5f99d70756e1c.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/eb53e482-0e70-4379-8a00-3066c660888e/ffg_allies_and_adversaries.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/13549899628.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/404409d7-403f-4e1f-bcf0-33e560e83ab2/jadogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df852e23-e1ff-4e5f-9a9a-10fd4eda3dfc/calha_parshall_tabela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3069c87-fab6-453a-9b04-7f0c1037cac7/lenetofarexemuro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6d30e44-759c-4aab-aad1-cf16d8e8d7e7/zubumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a92e662-9aca-4b60-b501-1d99afd5b9de/bumokutem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8c527cc-ca69-4bc8-8c15-4d609267c06f/kpss_a_grubu_deneme.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_off0000bbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCE 5336 bytes
SHA-256: 5fd9b22cff9ea94a594c4849df81fdb9719bb3e79353ef355a7d01d3dfdc38e7
font_01_sfnt_off0000cde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE3 10284 bytes
SHA-256: 6caaf7f1cb0cbc30bea5fe861e49398dce3783e9886e89020acd11c92fe7f54a

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