Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c582f18445cc1f0…

MALICIOUS

PDF

64.5 KB Created: 2020-11-18 01:46:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 723cd594bd91b98c3acecb50751d9cad SHA-1: 2648d547d8817823fce15e5536dca3f8edfa2033 SHA-256: 2c582f18445cc1f05cc5ecfcd9a2eaa0e6f4a6aca30a44bcc7017be907ffa74a
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, with one URL pointing to known malicious redirector infrastructure. This suggests the document's primary purpose is to lure users to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature.

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
  • 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=belkin+f5d7230-4+manual+espa%25C3%25B1ol In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376101/normal_5f8bb629e9637.pdfIn PDF document text
    • https://wudajelenap.weebly.com/uploads/1/3/4/4/134470879/zumolupanip.pdfIn PDF document text
    • https://kudaxemukuwofi.weebly.com/uploads/1/3/4/6/134691428/1981252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378160/normal_5f97c20e30470.pdfIn PDF document text
    • https://ladofozaser.weebly.com/uploads/1/3/4/3/134334290/c4b9d5018fcf.pdfIn PDF document text
    • https://vonojatu.weebly.com/uploads/1/3/4/7/134711894/saregedulose-vixemexexat-runovug.pdfIn PDF document text
    • https://kosemarenile.weebly.com/uploads/1/3/4/3/134315061/zewakasilimef-kubefu-kodimokifoza.pdfIn PDF document text
    • https://lesajevix.weebly.com/uploads/1/3/4/3/134318042/b8592d.pdfIn PDF document text
    • https://fafofezun.weebly.com/uploads/1/3/4/3/134338513/nakipigakazus-xufozafi-gafigotuk-fuxojo.pdfIn PDF document text
    • https://nawawuxilebop.weebly.com/uploads/1/3/4/6/134679594/zisumobiguvuwu-defewa.pdfIn PDF document text
    • https://bujapuvewujik.weebly.com/uploads/1/3/4/7/134702992/ecfc19bc1b30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370057/normal_5faacddc20010.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/50e412d4d6e.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_off0000bae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE6 6180 bytes
SHA-256: f450625ec0fea783942af6006460a59504b19895f44d03fed6b96408ad747598
font_01_sfnt_off0000cfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC4 10496 bytes
SHA-256: 766a0873406ef80032c3f72412c145f72297db8220df185ba5c69738673f48dc

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