Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c5aa1ca6244eb4…

MALICIOUS

PDF

74.1 KB Created: 2021-02-16 13:04:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 06e483071e389ea750f7d71f33f80e41 SHA-1: ce35ac497e28a8ef78b04328304208d6720ad3ca SHA-256: 71c5aa1ca6244eb49d10e5d66ecf4cd8b057ce8c9b71bf1397c9be22c578fa66
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and redirector infrastructure, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/strik?utm_term=whirlpool+front+load+washer+error+codes+5d In PDF document text
    • http://erkutungotu.com/7672124527596989.pdfIn PDF document text
    • http://xteenware.online/angular_templateurl_conditionalyl3s8.pdfIn PDF document text
    • http://reform-st.ru/14113581626w4qx.pdfIn PDF document text
    • http://giboxibefelas.22web.org/94213792009.pdfIn PDF document text
    • https://wexemexaxixu.weebly.com/uploads/1/3/4/7/134709907/355667.pdfIn PDF document text
    • https://betetaguzom.weebly.com/uploads/1/3/2/3/132303315/2f9fc.pdfIn PDF document text
    • http://navizuvexax.iblogger.org/pujajoguvuwagogodus.pdfIn PDF document text
    • http://persequenteamsohbet.com/gabodotokusisozidix2.pdfIn PDF document text
    • http://begedotupatato.66ghz.com/flashforge_3d_printer_file_format.pdfIn PDF document text
    • http://kihepc.xyz/acg_guidelines_pancreatic_cyst_2018omon0.pdfIn PDF document text
    • http://twoup-viktoria.online/51524893730occpp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xidiredojowezi.epizy.com/romeo_and_juliet_characters_movie_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/tewowebisuw.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/53703147492.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/free_printable_invoice_templates.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_off0000e582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE582 5472 bytes
SHA-256: fc596953e0615a41813348783a50734085b23bfb00b218fe7c883758f34effb5
font_01_sfnt_off0000f833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF833 10364 bytes
SHA-256: bfc9772862afd87db4e4bdf251f77ba9604fdb4b56f3a72d62f9d65be4348a5c

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