Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dad9d824ff0d0e1…

MALICIOUS

PDF

74.7 KB Created: 2021-02-16 00:55:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 793ff05aac05d797b197d6c30ddc7b65 SHA-1: f4ed62697f3053b05a4e3f800ce992bbb2253716 SHA-256: 6dad9d824ff0d0e19dd100d37deecdba53453db1c641cfc64bc0b3faf0f317ff
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/123?utm_term=how+much+do+used+keurigs+sell+for PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459322/normal_601d74c32b151.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/dekemutonoriponuwesiruzll7pm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426972/normal_601973b1e07f2.pdfIn PDF document text
    • http://vutatux.22web.org/taxonomic_classification_worksheet.pdfIn PDF document text
    • https://rurusoweloxefug.weebly.com/uploads/1/3/3/9/133989150/sukejexawuna-sikalejeroxok-banikis.pdfIn PDF document text
    • https://xiluxobafuju.weebly.com/uploads/1/3/5/3/135323992/6374906.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393790/normal_5ff42a77e2c1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468843/normal_5fddd55471c0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388407/normal_6015640965584.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393036/normal_60205f754323a.pdfIn PDF document text
    • http://verifybadgesbusiness.com/modulo_5_prepa_en_linea_sepw8ojn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378161/normal_5feb4eb47d93b.pdfIn PDF document text
    • http://welifenepural.iblogger.org/pafamijelak.pdfIn PDF document text
    • https://falatunasozenu.weebly.com/uploads/1/3/4/7/134762474/sajola.pdfIn PDF document text
    • https://kijemaroxajum.weebly.com/uploads/1/3/5/3/135397629/89075.pdfIn PDF document text
    • https://gikanirirexenad.weebly.com/uploads/1/3/0/7/130776133/zodetilipe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE811 5340 bytes
SHA-256: 858b96468ea825fed9dca4dffa710ddcd9139c02ff36320859b9644877987bf4
font_01_sfnt_off0000fa28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA28 10412 bytes
SHA-256: da6413b2fd2be4e3f5fd9e26f9c9150af9b5bf5fed6f528e8ccbc2b397869c65

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