Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0ffedefdef86e4…

MALICIOUS

PDF

80.0 KB Created: 2021-02-15 10:13:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 502d1857612559ecb6baf61e8ef7cebd SHA-1: 542641136c7ca7be88078d8c90a621c7fd8793b7 SHA-256: 8e0ffedefdef86e4f3e53d13cc7b1437f5b5a3026db831b2aec95c6491abcdd4
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-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://crophysi.ru/strik?utm_term=movie+box+ios+12.+2 PDF link annotation
    • https://cdn.sqhk.co/retagigimusa/Bhc7jh8/witodoxujonevad.pdfIn PDF document text
    • https://vigodabazo.weebly.com/uploads/1/3/4/8/134872933/7511235.pdfIn PDF document text
    • https://wanitovamuk.weebly.com/uploads/1/3/5/3/135303456/7959479.pdfIn PDF document text
    • https://sulunekuzesafap.weebly.com/uploads/1/3/1/4/131406846/wopuzegovoxav-xidabedupatofap.pdfIn PDF document text
    • http://reduslim-siteofficial.site/34084583627v3qi8.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/eOG3Cgf/joy_news_live_streaming_today.pdfIn PDF document text
    • https://foxuginatumusex.weebly.com/uploads/1/3/0/7/130775376/zivepepowati.pdfIn PDF document text
    • http://frut-tree.site/wiwuxusotobigotogabokugozk76zu.pdfIn PDF document text
    • https://cdn.sqhk.co/wajidafix/O5jcpij/zedge_free_ringtones_iphone_7.pdfIn PDF document text
    • https://deremorukoj.weebly.com/uploads/1/3/4/4/134490203/pogipixifelasowo.pdfIn PDF document text
    • http://mishabelle.ru/83097289709hn514.pdfIn PDF document text
    • http://microbladingeyebrowsdallastx.com/74136949074y69r4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500692/normal_600c07a9b3dd4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://piredesoki.epizy.com/98373464182.pdfIn PDF document text
    • http://nokizotef.rf.gd/xidis.pdfIn PDF document text
    • http://miloxirabufa.epizy.com/96978151295.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_off0000fc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC32 4828 bytes
SHA-256: 47c97539101cfd9aa5d3a41e2c21d661f1acb5d93869116efc49da378ecec15c
font_01_sfnt_off00010cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD6 10732 bytes
SHA-256: 0b38fa5e8df941be42c58d1b7d1b2ca245ccc204b07db03090e1dfb708d443bd

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