Malicious PDF — malware analysis report

Static analysis result for SHA-256 585d677efd06f22d…

MALICIOUS

PDF

78.5 KB Created: 2021-02-20 01:57:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ef54c6d217988cbb11d74f73b1427e41 SHA-1: b125cb401c4c33f3d6bded9373b36fe00f7b2f2e SHA-256: 585d677efd06f22d24c1db5ae3d8fe48ed4f787ca9c3db761f10dda3a873eb8f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious or link-farming sites, suggesting an attempt to redirect users to phishing or malware distribution pages. The PDF structure and embedded content are indicative of a lure, likely designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://jottigo.ru/wix?keyword=figurative+language+in+the+color+purple PDF link annotation
    • https://wegakerovosa.weebly.com/uploads/1/3/0/8/130873826/4bd382eae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447433/normal_6017245e07ca5.pdfIn PDF document text
    • http://ses-paypal.com/common_core_math_worksheets_3rd_grade_area7n7kb.pdfIn PDF document text
    • http://vupofapotonez.22web.org/23312297901.pdfIn PDF document text
    • http://onlajn-kassa.ru/mukewizuymp5q.pdfIn PDF document text
    • http://vebilodugisugod.iblogger.org/pdf_to_word_converter_free_google.pdfIn PDF document text
    • http://tlgfree.xyz/statistics_for_the_behavioral_sciences_10th_edition1od36.pdfIn PDF document text
    • http://lelonul.iblogger.org/luxegutiwebezefizanu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vekujekodabudu.epizy.com/lujedodutaxema.pdfIn PDF document text
    • http://pexevogawi.epizy.com/71697981944.pdfIn PDF document text
    • http://xomogovi.epizy.com/fakev.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_off0000f867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF867 5032 bytes
SHA-256: 6b7f2e8a512b62d4f6dfa35f9c7471487e0672a31a43e9206f3c44bac8706d2a
font_01_sfnt_off00010990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10990 10420 bytes
SHA-256: 805c6d7f73d3ddc776bd2d8f87e79b1be274d11999d3bea9b1061504fb08ddd9

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