Malicious PDF — malware analysis report

Static analysis result for SHA-256 78aa6e4588f1f6f1…

MALICIOUS

PDF

93.2 KB Created: 2020-11-14 01:56:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 01086633c06af8bde7de2ca6994b11d9 SHA-1: dd5235cbc52d91ab1097a0f05b533f58aee32441 SHA-256: 78aa6e4588f1f6f1a8117edccec07fb1f703167e2a29d16077573bfa04970102
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://trafficel.ru/strik?utm_term=tcp+congestion+control+dd+wrt PDF link annotation
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/c558058877e76a9.pdfIn PDF document text
    • https://wofexexugov.weebly.com/uploads/1/3/4/3/134318452/kiroxuzane.pdfIn PDF document text
    • https://lodejudimawepum.weebly.com/uploads/1/3/4/3/134350935/satovexaki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368999/normal_5f881e559450d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5f887da024620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387806/normal_5f90e9a9559de.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/vanojiraxajerubefiza.pdfIn PDF document text
    • https://sifidapive.weebly.com/uploads/1/3/4/5/134526041/tasipozijusajuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471479/normal_5fa7fc1e72282.pdfIn PDF document text
    • https://fofaxofik.weebly.com/uploads/1/3/4/5/134521529/josokojo-godivudobajozo-zizenijineruxuz.pdfIn PDF document text
    • https://jinunezig.weebly.com/uploads/1/3/4/3/134308797/d16c55ea52d.pdfIn PDF document text
    • https://wokumedepawal.weebly.com/uploads/1/3/4/6/134607606/lagepu.pdfIn PDF document text
    • https://daxusakisawepan.weebly.com/uploads/1/3/4/5/134527958/3e21d9e4.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/zobuwubedak/chicago_recycling_number_6.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_off00012e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E72 5072 bytes
SHA-256: c6a67194cf6cc3aaf83b5fc1d1d232b2ca0cb0789dafd4788ad0c699cdb1908f
font_01_sfnt_off00013fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FDA 11764 bytes
SHA-256: 88cd82c9cff9d1421e1664e0de1c4029d89cd051c296be2f34c37245ffd6f794

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