Malicious PDF — malware analysis report

Static analysis result for SHA-256 b123ae6299ee51f4…

MALICIOUS

PDF

81.0 KB Created: 2020-11-13 08:19:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1c412950943a5ccf0fddf2541fbbdee5 SHA-1: 23827783d010204970ce85dba267b261e5ca4e4d SHA-256: b123ae6299ee51f48f52f56cc423e961db4f3ad85fb047805d612db0d3da64f9
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file functions as a link farm, containing numerous links to external documents. One of these links directs to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a lure to exploit clients.

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
  • 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://traffmen.ru/aws?utm_term=significado+de+distribucion+uniforme+en+biologia In PDF document text
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/nakomujuwevi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415300/normal_5f95f693a53e6.pdfIn PDF document text
    • https://dirojobadenanew.weebly.com/uploads/1/3/4/1/134109317/zarabeleka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378856/normal_5fa464c9d9556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482671/normal_5fad33fa64704.pdfIn PDF document text
    • https://tasukivokojut.weebly.com/uploads/1/3/4/5/134592673/roxirebudes_kiduzomepef.pdfIn PDF document text
    • https://kufojomarolov.weebly.com/uploads/1/3/4/4/134401526/4521481.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421770/normal_5fa904b0c26b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426701/normal_5f9cc7c521aab.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/jizuginotu-timuwufixawojer-fajumuxozi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cecb081-7245-40a1-af90-fa2d12a079fa/alcohol_boiling_point_trends.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/plague_inc_evolved_parasite_normal_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wepeliniru/mibitozobududozena.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/enzymes_worksheet_answer_key_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/chamara_weerasinghe_nonstop_2017_free.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_off0000fe59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE59 5584 bytes
SHA-256: 2bcc68ab365cb39e138d5a036c5a244898713256b1dee954506b5f0213a4901e
font_01_sfnt_off00011146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11146 11348 bytes
SHA-256: 311ccfc7d25b02531b14e50cd6c170459ce1c33826aa86ecf1dbeb521cd8b3c4

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