Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c103c485c5843e…

MALICIOUS

PDF

77.8 KB Created: 2021-01-12 03:44:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: c208b9252089fc0d0edc65cd6edef5fb SHA-1: 2f1051daa9b839995ec47c3c18cd20a01d4f17b1 SHA-256: b8c103c485c5843eba5fdb78811ef22330aaeae7deb6f1f9b1b2b45d104f53f5
244 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 and routes users through malicious redirector infrastructure. 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=what+is+mollejas+de+res In PDF document text
    • https://site-1225176.mozfiles.com/files/1225176/vinibiniduvila.pdfIn PDF document text
    • https://xawavefite.weebly.com/uploads/1/3/4/6/134667803/5491796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466413/normal_5fb9243337a0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388063/normal_5f906cba31336.pdfIn PDF document text
    • https://naluzamuro.weebly.com/uploads/1/3/4/5/134516405/lizipagadebekewibef.pdfIn PDF document text
    • https://site-1168265.mozfiles.com/files/1168265/the_ultimate_app_for_viral_videos.pdfIn PDF document text
    • https://site-1172155.mozfiles.com/files/1172155/xedonobogoxitesip.pdfIn PDF document text
    • https://regogugone.weebly.com/uploads/1/3/4/8/134891767/2d04f6.pdfIn PDF document text
    • https://site-1180490.mozfiles.com/files/1180490/85469985032.pdfIn PDF document text
    • https://debemalimuwu.weebly.com/uploads/1/3/4/3/134385929/kigivu.pdfIn PDF document text
    • https://site-1168153.mozfiles.com/files/1168153/salokawup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415534/normal_5fd261f1d826b.pdfIn PDF document text
    • https://wisolowiguwo.weebly.com/uploads/1/3/4/6/134630140/kebefixumatisopi.pdfIn PDF document text
    • https://site-1166608.mozfiles.com/files/1166608/57031829290.pdfIn PDF document text
    • https://wegonugu.weebly.com/uploads/1/3/4/0/134040733/4993021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368742/normal_5f87c109dd976.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55E 4836 bytes
SHA-256: 76cafd9c2046eba20dbff2edc196ece3ab6bdc6b2587a2f59000c80b26cd6937
font_01_sfnt_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 11416 bytes
SHA-256: a42021bb9016722ad492e257d9225e16ebb9f39d6aae7acc4ed6502b9468efe1
font_02_sfnt_off00011c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

Open this report in the interactive analyzer, or submit your own file for analysis.