Malicious PDF — malware analysis report

Static analysis result for SHA-256 152b7cd6f3a206b5…

MALICIOUS

PDF

86.7 KB Created: 2020-11-19 14:49:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8b945005f755b0e9e500a0efd7218f30 SHA-1: 9ceedb72b7e9a908181bdabe84c871d0f642a035 SHA-256: 152b7cd6f3a206b5506a17eae395606c468865c5b59f5888c9108afd27252ddf
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded links, many of which point to redirectors or known malicious infrastructure, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to a digital voice recorder manual.

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 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.
  • 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://cctraff.ru/123?utm_term=olympus+digital+voice+recorder+vn-5200pc+manual+espa%25C3%25B1ol In PDF document text
    • https://penulikadima.weebly.com/uploads/1/3/1/4/131482887/9051401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454977/normal_5fa3b683c3824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368998/normal_5f882a00102ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370302/normal_5f94f51cb5a0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481154/normal_5fac2d06a9424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375095/normal_5fb25ec0a853c.pdfIn PDF document text
    • https://jugevubudi.weebly.com/uploads/1/3/4/5/134515938/6004610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371787/normal_5f930a0120d35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382784/normal_5fac5ed5b2c3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372074/normal_5f9a3235d2080.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
    • https://uploads.strikinglycdn.com/files/3fd32490-52ac-4ef8-9a03-c0b97b1e640e/5946254556.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/5208448234.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/enumclaw_high_school_football.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/weather_report_glens_falls_new_york.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c835e8f2-1be0-43db-8191-52b3c78dc96c/clash_of_clans_hileli_apk_cepde.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/altivar_312_canopen_communication_manual.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_off0000ffb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB9 6104 bytes
SHA-256: 39bbaf53c1c732f4cc6a8c536eadb2a96153da0a9338833f2ad49bb61a977b7e
font_01_sfnt_off00011438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11438 12164 bytes
SHA-256: 1aea7c0ea40962701c1e2a8cceda41847d047ab9011dfb5b771a3db067035cf4
font_02_sfnt_off00013cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBE 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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