Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c16369e4c59bd32…

MALICIOUS

PDF

83.7 KB Created: 2021-03-01 07:52:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2cf344248507a2e59129b7ce0279dd5a SHA-1: b29a412346989b34d6c30330e03356b292bef278 SHA-256: 5c16369e4c59bd32a66b99b633872e8c314a7248cf3b917252f0819d1b4f1163
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The primary finding is a large farm of external links, many hosted on disposable domains or services like Weebly, suggesting a possible SEO manipulation or phishing campaign. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/wix?keyword=hanes+middle+school+supply+list PDF link annotation
    • https://kiwakobomu.weebly.com/uploads/1/3/1/4/131482833/5281290.pdfIn PDF document text
    • https://xewulatejema.weebly.com/uploads/1/3/5/3/135345986/nabelixolavowu-ridesijelek.pdfIn PDF document text
    • https://tivexafo.weebly.com/uploads/1/3/4/3/134348633/f648e5e49c1658.pdfIn PDF document text
    • https://bamukozigo.weebly.com/uploads/1/3/1/4/131406799/75a75086ad1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489440/normal_5fca4c8fd88d6.pdfIn PDF document text
    • https://xoxujodega.weebly.com/uploads/1/3/4/3/134363828/wugeb_sitew_faxusitu_rarekewagisadab.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/21107971405.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/xukidinujuregebizixafewe.pdfIn PDF document text
    • http://lafilubepojev.scienceontheweb.net/richard_bandler_john_grinder_pnl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410201/normal_5ff3dadf2fca6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409258/normal_601324c0e309a.pdfIn PDF document text
    • https://redejejilitut.weebly.com/uploads/1/3/5/3/135305696/xetilobovadosut.pdfIn PDF document text
    • http://vijuziruzunubiz.iblogger.org/40617199274.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://newewixojarulup.epizy.com/krgv_weather_report.pdfIn PDF document text
    • http://puwomuf.rf.gd/nimagogikutawa.pdfIn PDF document text
    • http://kokibitumoxa.epizy.com/67196106705.pdfIn PDF document text
    • http://rodiwube.epizy.com/94481176755.pdfIn PDF document text
    • http://zemofebu.epizy.com/restless_2011_movie.pdfIn PDF document text
    • http://nixomirorubu.myartsonline.com/simple_present_tense_negative_exercises.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF406 5164 bytes
SHA-256: 18fa4138dfdfbefa69532bb5355dd04ea86487437795dc75f866f8bf731079d4
font_01_sfnt_off0001055f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055F 14544 bytes
SHA-256: f1bed5ab27b9a05b408234758b18dbbd91a68b37a785e72cc33d0ff5cae060f5
font_02_sfnt_off0001336f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

Open this report in the interactive analyzer, or submit your own file for analysis.