Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbbaf6f159ca8800…

MALICIOUS

PDF

69.7 KB Created: 2020-11-24 22:07:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 07c51392575da7b9bf77a17a97b72142 SHA-1: 977a63879928bf44ddc19b78ed3c9f0ee73b6d6c SHA-256: cbbaf6f159ca8800725375e2e298283af8bc693a53526f5e6a12f888bb1bbd5a
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/strik?utm_term=the+federal+in+federalism+icivics+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424029/normal_5fae934ea98f5.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/zevatoxa.pdfIn PDF document text
    • https://zafigitelerom.weebly.com/uploads/1/3/4/3/134338481/jaxape_wijizexuzif_penat_zalivi.pdfIn PDF document text
    • https://vibotulazibet.weebly.com/uploads/1/3/4/7/134729177/revog.pdfIn PDF document text
    • https://ziroluberunoreg.weebly.com/uploads/1/3/4/4/134456507/futinefigob.pdfIn PDF document text
    • https://nujuwededewomoj.weebly.com/uploads/1/3/4/3/134305400/galipem.pdfIn PDF document text
    • https://devigumekumowir.weebly.com/uploads/1/3/4/3/134394761/5388998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369777/normal_5fa2a46b5ad1f.pdfIn PDF document text
    • https://tupekado.weebly.com/uploads/1/3/4/5/134514551/sizusapiletujalepav.pdfIn PDF document text
    • https://xegoguvaposa.weebly.com/uploads/1/3/4/6/134677344/jozolunetamisenixux.pdfIn PDF document text
    • https://nexirexosevexos.weebly.com/uploads/1/3/4/5/134500935/832031.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387035/normal_5fa70927f05c9.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/gezumuwavizegekis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_5f9b2ac1be85b.pdfIn PDF document text
    • https://nusisudarebo.weebly.com/uploads/1/3/4/3/134349377/zigazapuzujim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/bileik_faiz_forml_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/bad_guy_piano_sheet.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_off0000d475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD475 5360 bytes
SHA-256: ff0de6e7717e204ca592c44c3da8ab167e12ea84a4db5688c299ebbc705dac4d
font_01_sfnt_off0000e698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE698 10360 bytes
SHA-256: eac4c1182c717fe24eb87c19b3b68f9b164b931100f57f2f6976bbeecfe40554

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