Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ecf60d7b1e24feb…

MALICIOUS

PDF

170.1 KB Created: 2020-11-14 11:45:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b92490b5f3c8440c13d93254528ccc8a SHA-1: 3925b14434ef7315d19e2f67f1d09910fda1f2bc SHA-256: 4ecf60d7b1e24febd3647d725e0fb2f23341572bc5b780e99c4d8782d4aaab88
184 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link to malicious infrastructure. The document contains a large number of embedded URLs, many of which point to disposable hosting or known redirectors, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the presence of numerous links indicates a likely attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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=fox+creek+elementary+school In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380079/normal_5f8c6b1a39ead.pdfIn PDF document text
    • https://wotigutaz.weebly.com/uploads/1/3/4/3/134361511/610f6778e0fa345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385011/normal_5fa9249824c4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458125/normal_5fada975b9555.pdfIn PDF document text
    • https://ramokazadi.weebly.com/uploads/1/3/4/4/134470245/5511121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393502/normal_5faa57b45eaad.pdfIn PDF document text
    • https://kejedavozeve.weebly.com/uploads/1/3/1/4/131483662/sigoregiver.pdfIn PDF document text
    • https://mujugoseboli.weebly.com/uploads/1/3/4/3/134312554/9c31b.pdfIn PDF document text
    • https://nabofirolem.weebly.com/uploads/1/3/4/6/134632364/domulosiverat.pdfIn PDF document text
    • https://kolivobaka.weebly.com/uploads/1/3/4/5/134500933/2005242d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/31230930684.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/stoichiometry_worksheet_4_mass_to_volume_answers.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_off000264d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x264D0 5228 bytes
SHA-256: 0ec98c204bc4b64354ef517e925eac03102b4913d39f6093657d5814d153904a
font_01_sfnt_off00027677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27677 10812 bytes
SHA-256: 1d76634e56792c291b6931148b7cbbfe657ddeb5153180576a7be00f29241838

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