Malicious PDF — malware analysis report

Static analysis result for SHA-256 20776a694b354712…

MALICIOUS

PDF

69.5 KB Created: 2021-03-31 23:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 19dd092abfeec91cfa571c3c61391bb3 SHA-1: 17728a14114f0128569df767ea99159669e52881 SHA-256: 20776a694b354712a808bd624c5bc3bee130dff5c9a87399b2cabb0f6b839f67
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://seumenha.ru/123?utm_term=cricket+captain+2019+apkmonk PDF link annotation
    • http://gutagige.sportsontheweb.net/prayers_that_bring_healing.pdfIn PDF document text
    • http://gepanukotex.getenjoyment.net/29305268563.pdfIn PDF document text
    • http://ferafukapawap.scienceontheweb.net/3._4_cambio_climtico_global_causas_y_consecuencias.pdfIn PDF document text
    • http://siwikilapezufi.iblogger.org/madewilawerumo.pdfIn PDF document text
    • http://sikevemekoma.mypressonline.com/zapivujadut.pdfIn PDF document text
    • https://wuzesitawe.weebly.com/uploads/1/3/4/7/134733123/1a1b0f67c80.pdfIn PDF document text
    • http://larijasetejupaz.mypressonline.com/abstract_algebra_mit.pdfIn PDF document text
    • https://jurogewogil.weebly.com/uploads/1/3/4/3/134318518/1405823.pdfIn PDF document text
    • https://tapebosipufadiz.weebly.com/uploads/1/3/4/3/134366988/aa8574cb0ac.pdfIn PDF document text
    • http://pegejoruvufiron.sportsontheweb.net/astable_multivibrator_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/bouYjg8/waxesolim.pdfIn PDF document text
    • https://badoxilorapa.weebly.com/uploads/1/3/5/3/135347885/4246267.pdfIn PDF document text
    • http://mukogojusilu.iblogger.org/kafiwitoboxarigibadoxada.pdfIn PDF document text
    • https://lexabebuwapo.weebly.com/uploads/1/3/1/3/131383838/femujosivotix.pdfIn PDF document text
    • http://dunodipike.sportsontheweb.net/11988309374.pdfIn PDF document text
    • https://cdn.sqhk.co/tuvameboroke/cV5icjf/39366673624.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://satogitexuvo.myartsonline.com/pdf_to_jpg_converter_software_free_download_for_windows_10.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_off0000d39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39D 5320 bytes
SHA-256: d65b09930b838dc5b6797fd914e65b2f64236829cd956efa90706b119ebeb2e3
font_01_sfnt_off0000e5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AA 10324 bytes
SHA-256: c84509687fff2c8392fedc4bd2dd017a4c038252bf743b091e312d33f2c2a22d