Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18e90ef8b871418…

MALICIOUS

PDF

82.1 KB Created: 2021-02-22 20:05:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 30e87080b35dbbefa4ff24aca92ba5ef SHA-1: fd63a28c0e36ec548c48eec36a6067aa6b9e99d0 SHA-256: d18e90ef8b871418e36736b21e1d9f49cccaf7268bbcef83950b1e880ff57578
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by both ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation scheme. One URL, https://maypoin.ru/aws?utm_term=best+fast+charging+power+bank+2019+india, appears to be a lure for potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://maypoin.ru/aws?utm_term=best+fast+charging+power+bank+2019+india PDF link annotation
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/pubuwoxiwowisim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417128/normal_602c075a6d91b.pdfIn PDF document text
    • https://fobulosarurek.weebly.com/uploads/1/3/3/9/133997379/xozuwanoruxa.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/W9phcdN/scary_movie_sound_effects_download.pdfIn PDF document text
    • http://urro-hu.com/delete_watermark_online_freeulw7g.pdfIn PDF document text
    • https://cdn.sqhk.co/daladovum/CghpSV2/jepudonetobido.pdfIn PDF document text
    • https://cdn.sqhk.co/tubadaluzafu/ggYibuk/23245256948.pdfIn PDF document text
    • http://lami-lashes.site/6186413736989i13.pdfIn PDF document text
    • http://trenketo.buzz/blue_book_equivalent_for_rvsyt8yu.pdfIn PDF document text
    • https://cdn.sqhk.co/fipufose/hbGigXC/gubasiwiba.pdfIn PDF document text
    • https://webavetoromezo.weebly.com/uploads/1/3/5/3/135346546/a394821961a0e03.pdfIn PDF document text
    • https://pawizujepus.weebly.com/uploads/1/3/1/6/131637171/5f677.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/ribowexulo/face_recognition_android_api_free.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_off000102e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E1 6212 bytes
SHA-256: df3ec52edcd9871f3e894d0c06f5c7cef4e1a1867ad1e0ea49690fba3aaf42a2
font_01_sfnt_off00011817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11817 10364 bytes
SHA-256: e1312c0cc141f2707908e6d8197abf1f3b1ca7f790b332a2b0df0d47318ee5cd