Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d90605d465d8a08…

MALICIOUS

PDF

73.4 KB Created: 2021-05-26 16:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e64c4509a498ea2b4d44dce7ac38b256 SHA-1: 2496f6c2cb18f4a63e8333c18314fdbb7e01d7ea SHA-256: 1d90605d465d8a0885c77a332eaa68f7052e32092db287b6b1e212b2817e446c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful websites, possibly for credential harvesting or malware distribution.

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://botokaw.ru/strik?utm_term=syllables+worksheets+kindergarten+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451545/normal_603d39c09f6f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386084/normal_5ffa9d0668feb.pdfIn PDF document text
    • https://xajufaxisadu.weebly.com/uploads/1/3/4/5/134585978/e26c56e1e.pdfIn PDF document text
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/350b4cd41.pdfIn PDF document text
    • https://fovivijidilel.weebly.com/uploads/1/3/4/8/134888041/1017080.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494166/normal_5fc9e24f68c57.pdfIn PDF document text
    • https://ziduxaxeg.weebly.com/uploads/1/3/1/3/131380546/9402869.pdfIn PDF document text
    • https://rexaririwe.weebly.com/uploads/1/3/1/6/131637114/tudewovujutafusiwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478133/normal_5fc65e91b107f.pdfIn PDF document text
    • https://dixevivoruze.weebly.com/uploads/1/3/1/4/131437918/8d2febc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408983/normal_606e1fe5a85cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465565/normal_5fd23ebac8902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407747/normal_5fe7849e0c671.pdfIn PDF document text
    • https://lisebozaran.weebly.com/uploads/1/3/4/6/134694889/wumet.pdfIn PDF document text
    • https://volejodanuba.weebly.com/uploads/1/3/4/5/134593723/savuranifulo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446512/normal_60117d1f8fdca.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/f41bf182bd6aa3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e950373-435a-4f8b-9e73-be7050c57f6c/how_to_turn_up_volume_on_soundpeats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77efa077-9fdf-465e-8681-670a4903868b/weight_of_sony_wega_36_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce4c350d-030a-4cbd-bd7a-a2f24d05f5fc/how_long_to_wear_mouth_guard_for_tmj.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_off0000dfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB9 5804 bytes
SHA-256: 517e4cf8b395eb12f5f0f01f786ba88a01edb47eb9ae712e1167c0db8288bf0d
font_01_sfnt_off0000f38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 10816 bytes
SHA-256: ea779318aefeb61ea0927c5de6ad4e9b88b4e9567df114223fc52c24b615e7b2