Malicious PDF — malware analysis report

Static analysis result for SHA-256 77bc6e08c7dd9104…

MALICIOUS

PDF

72.1 KB Created: 2021-01-21 19:01:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ce0f0aa17951d278f13df2daf95aca2a SHA-1: e2b7ef4f3d0f1e54448f3b13b4114d23f217ae79 SHA-256: 77bc6e08c7dd9104912839577a13aa5e3d0daa3e4d73cb464df21df65ef99b26
172 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 ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or a distribution mechanism for further payloads. The document body, though partially corrupted, contains text related to a 'Town of Needham water bill', indicating a lure to trick the user into downloading a malicious PDF. The presence of numerous external links and the 'invoice/payment lure' heuristic strongly suggest this document is designed to facilitate the download and execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/123?utm_term=town+of+needham+water+bill PDF link annotation
    • http://ragitikevuwa.22web.org/raxosuvugajibapilo.pdfIn PDF document text
    • https://doxugibako.weebly.com/uploads/1/3/0/7/130776338/xotuwidebo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368237/normal_5ff60cbe5fca3.pdfIn PDF document text
    • https://razitesewiwi.weebly.com/uploads/1/3/2/8/132815022/8996162.pdfIn PDF document text
    • http://gokojemisivuf.22web.org/56420284862.pdfIn PDF document text
    • https://demujerifusa.weebly.com/uploads/1/3/1/4/131437649/jefixajowuje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391611/normal_5ff1de4f2afd7.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/fr0ihFJ/survivalcraft_2_2._2_download_pc.pdfIn PDF document text
    • https://ralixuviromod.weebly.com/uploads/1/3/5/3/135345966/puporasulo_javujilodowuxon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467027/normal_5fcff6c694132.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458623/normal_5fff5e715baef.pdfIn PDF document text
    • https://bagawilikazukir.weebly.com/uploads/1/3/1/0/131070307/9361048.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/cf3jiig/parkour_simulator_3d_unblocked.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/financial_reporting_cpa_course_outline.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/abitha_diyani_full_episode.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/viscosity_astm_d445.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/shukran_ya_rabi_shukran_audio.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_off0000dd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9D 5148 bytes
SHA-256: ccea046a13bdc65e0ee2af448ad4e40076eeae16bcbe603baeafbb6b7caf6bfe
font_01_sfnt_off0000ef04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 10656 bytes
SHA-256: d3b9e6f9b9024d7e8a03267c66dcf4c1f99223ee01f5f4f3ae4bf80f9f719e18

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