Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ee1978407b6817…

MALICIOUS

PDF

69.6 KB Created: 2021-01-20 08:40:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e9bf55ecf897c82de6e217e2f42e5c3b SHA-1: 142634e4ef96ef3d2988db724a7c4ce27e1f218b SHA-256: 56ee1978407b68178084a77328a2ce3f6ddafb2804dfb7f413a12329107bf377
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. The presence of numerous links, many pointing to disposable hosting or redirectors, strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffmen.ru/123?utm_term=burbujas+de+amor+meaning In PDF document text
    • https://tuboxivodase.weebly.com/uploads/1/3/4/3/134387713/lozunada.pdfIn PDF document text
    • http://suwudera.22web.org/nature_wallpaper_images_hd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389080/normal_5ff42f5085bbd.pdfIn PDF document text
    • https://gatokoliza.weebly.com/uploads/1/3/0/7/130739470/xarotunexebalazoj.pdfIn PDF document text
    • https://xonesomo.weebly.com/uploads/1/3/0/7/130739362/6311582.pdfIn PDF document text
    • https://zoxexalibefan.weebly.com/uploads/1/3/0/9/130969973/8716430.pdfIn PDF document text
    • http://jebumivusesujan.iblogger.org/performance_appraisal_self_evaluation_templates.pdfIn PDF document text
    • https://bazatodeniwumov.weebly.com/uploads/1/3/0/7/130739274/totazevimubi.pdfIn PDF document text
    • https://duketexu.weebly.com/uploads/1/3/4/7/134725944/namumolokezevesu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://detotoga.epizy.com/joviv.pdfIn PDF document text
    • http://pasivete.epizy.com/all_live_tv_apk_for_android.pdfIn PDF document text
    • http://magajavopisili.epizy.com/wesuxumap.pdfIn PDF document text
    • http://fegumipidibig.rf.gd/bevud.pdfIn PDF document text
    • http://watokugen.epizy.com/80412152353.pdfIn PDF document text
    • http://navibizo.rf.gd/avira_antivirus_security_2019_apk.pdfIn PDF document text
    • http://bizebiza.rf.gd/dp_bbm_animasi_bergerak_islami.pdfIn PDF document text
    • http://voferinokubusob.rf.gd/arrival_guides_amsterdam.pdfIn PDF document text
    • http://degepedafapuf.epizy.com/genesys_android_character_sheet.pdfIn PDF document text
    • http://puwagof.rf.gd/sheet_cakes_decorated_with_balloons.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_off0000cff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF6 5380 bytes
SHA-256: 39918572c7c2d5175a37e98ad552e7bbc9f985f1c55cd557b67d3d1ecd76beb4
font_01_sfnt_off0000e22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22A 11492 bytes
SHA-256: 5517331cc8ce1bcde46d4456fa41be0e7ec492e64cb003b7b38ba9e5f4077970

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