Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5ecda4fa0753b5…

MALICIOUS

PDF

78.2 KB Created: 2021-03-19 08:58:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b63f89c79f579a91643540168fe67c5c SHA-1: 5c4dcbddea9570f2a64d963279c4df187507139f SHA-256: 8d5ecda4fa0753b579b848400feac24a03c9ce24499d2de0074690337e68fa8a
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs and the document's structure point towards an attempt to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/123?utm_term=archie+comics+sabrina+the+teenage+witch+pdf PDF link annotation
    • https://sezibuginodeso.weebly.com/uploads/1/3/4/4/134470526/fedilimenedula_foxuv.pdfIn PDF document text
    • https://bokepamukabina.weebly.com/uploads/1/3/5/2/135293240/towemimipu_jidunomenotoful.pdfIn PDF document text
    • https://natevifenug.weebly.com/uploads/1/3/5/9/135986161/pedunegomatuduxa.pdfIn PDF document text
    • https://xobisopi.weebly.com/uploads/1/3/1/3/131379629/wumenuli.pdfIn PDF document text
    • https://soresewo.weebly.com/uploads/1/3/1/0/131069968/b405e430.pdfIn PDF document text
    • https://zogudoweno.weebly.com/uploads/1/3/1/6/131637773/7559d14.pdfIn PDF document text
    • https://bibutijelogoper.weebly.com/uploads/1/3/2/7/132740620/5176356.pdfIn PDF document text
    • https://jorojesa.weebly.com/uploads/1/3/4/8/134861508/ziwovap-moximadexiwo.pdfIn PDF document text
    • https://tofeligekejogen.weebly.com/uploads/1/3/4/8/134873344/vipudinufenubug_fokodedepa_nonazasuki.pdfIn PDF document text
    • https://kodetinerimaguw.weebly.com/uploads/1/3/5/3/135347088/1443646.pdfIn PDF document text
    • https://lijipowurop.weebly.com/uploads/1/3/4/3/134314174/82b36d58608c8a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_9b3b2e870c5342398dc24c9429192dba.pdf?index=trueIn PDF document text
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_bda0dab287d742e3aa7e8c68b505cf05.pdf?index=trueIn PDF document text
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_d328d27dabe44f409a54b55a68a6cbf7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jakujakula/7796673907.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/nelukotisawetur.pdfIn PDF document text
    • https://203e60c5-e32a-4587-ab6d-31d66de6d5b9.filesusr.com/ugd/014c36_dd4edcf30f774899afe8d615a38742b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/hd_nature_screensavers_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/39429442540.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/11276760488.pdfIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_2da51f3244fb4997b2f36c90fb93516c.pdf?index=trueIn PDF document text
    • https://7a48fde5-f9d1-4ce4-84a2-8b156d245d18.filesusr.com/ugd/8127dd_e22b249d5b424f1da1df369544fcdd92.pdf?index=trueIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_00f375c502cf408b8d32839f7e5321f8.pdf?index=trueIn PDF document text
    • https://3df016ad-b40f-424f-9918-b96c60f46212.filesusr.com/ugd/387bfe_7c7701d6aa4d49f5abf1516e7b6da683.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 5760 bytes
SHA-256: 1588ddbc8a81553a6fb87b75e95111f81e5f491da6d51738adc36de44a62fc41
font_01_sfnt_off000105a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A0 10944 bytes
SHA-256: 5c541c85b41c2bf7ecb5b6eda951934a696ce057343dc28fb508a84a2f861e94

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