Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da8a521f108bf6b…

MALICIOUS

PDF

77.9 KB Created: 2021-02-13 12:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d32e54204616632fce88228d60168393 SHA-1: cd4d6fdf136a03ab5065edb1c9964bfbab07c997 SHA-256: 2da8a521f108bf6b97f98ef69b95e5e7be433ce98e39fae0255ff3522663b3f2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, suggesting a phishing or SEO spam campaign. The presence of external URIs and the overall structure strongly suggest this document is part of a larger effort to redirect users to potentially harmful content.

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
  • 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=neufert+pdf+gratuit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405950/normal_5fe6965e80be8.pdfIn PDF document text
    • http://juronesewuku.22web.org/apple_facetime_answered_on_another_device.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/ninezolezulonivonaxelimujcb4b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413590/normal_5ff5c0778fe76.pdfIn PDF document text
    • http://feyakast.online/lipid_guideline_updatevhpgh.pdfIn PDF document text
    • https://saxarewuvopa.weebly.com/uploads/1/3/4/8/134855039/nolijir.pdfIn PDF document text
    • https://xotomunekezej.weebly.com/uploads/1/3/1/0/131070571/9f3c7601ff050b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393346/normal_5ff486b187e96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486971/normal_5fe7ae1f929ce.pdfIn PDF document text
    • http://lexibanoma.iblogger.org/54508566336.pdfIn PDF document text
    • https://rivezotuxo.weebly.com/uploads/1/3/5/3/135337491/7511192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445129/normal_5fd5f2dc4242f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485442/normal_6003a926139ef.pdfIn PDF document text
    • http://golepikoxeware.22web.org/aosp_android_pie_rom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381964/normal_5fc810795673c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375885/normal_600c1584b7d36.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vanakodezifezuv.epizy.com/kononikek.pdfIn PDF document text
    • http://sufelubunat.epizy.com/91218135964.pdfIn PDF document text
    • http://todonoto.epizy.com/piwameselojamikolida.pdfIn PDF document text
    • http://gixopesibesuges.epizy.com/adapticons_full_apk.pdfIn PDF document text
    • http://widurema.epizy.com/wokedewum.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_off0000f1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EA 4968 bytes
SHA-256: 98ec059f93f7b18e65670d938ecedc4417c427345084b01fd8f91363f5bd65be
font_01_sfnt_off000102ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 11832 bytes
SHA-256: 48d9c9151ef8436e2db47eacd64acfae818c0b2b64f3a9ca257cbb1648ac000b

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