Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bd7b1213c59e18…

MALICIOUS

PDF

69.1 KB Created: 2020-11-23 21:25:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 11941cd5d0ada7ff4c5f6b0d4b996e14 SHA-1: 2099b7b1309f8402c32dd42f0aea85c2e82963db SHA-256: b8bd7b1213c59e18fe9d35f6b44832cbade10939138da192f6ec894c5f7f36b1
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 0.9994

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
  • 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/strik?utm_term=alamo+4+star+muzzle+brake In PDF document text
    • https://mapizijef.weebly.com/uploads/1/3/4/4/134493838/femipakatak.pdfIn PDF document text
    • https://zanelonovubut.weebly.com/uploads/1/3/4/3/134315015/6436846.pdfIn PDF document text
    • https://detaxotipag.weebly.com/uploads/1/3/4/7/134730838/xobemusam.pdfIn PDF document text
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/baziziroguvog-teronekox-lifuxi-najaloka.pdfIn PDF document text
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/pesomud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478146/normal_5faf171ace9cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465136/normal_5fad7b56ec9f7.pdfIn PDF document text
    • https://bizalaso.weebly.com/uploads/1/3/4/4/134443832/vujidinepadatu_xiropowe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403120/normal_5fa23e7eba255.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
    • https://uploads.strikinglycdn.com/files/a021ff98-a240-4637-8bf5-6e5a182ccd50/xasel.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42F 4892 bytes
SHA-256: 8d4c5c99b5b782af5956a23550b63412fce975c97a0e3a8e749ce794f4c0e3f6
font_01_sfnt_off0000d4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E5 10820 bytes
SHA-256: a6fa2821384d7b6b90b9749e5785eac2fb42f59302ccf3f8086c3bb4c1f6ef78
font_02_sfnt_off0000fa0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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