Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5af77cc3fb469e…

MALICIOUS

PDF

66.8 KB Created: 2020-11-20 14:10:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f9b25638da76e7b6405a3f5101d78d17 SHA-1: 9348f93d6c54e153361ec895d79e32cf2f619c34 SHA-256: 1e5af77cc3fb469e1bf3bc68342662ff36d0b8a203ed1571525ac3dbc18b3dc7
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 0.9997

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://traffking.ru/strik?utm_term=5th+grade+career+projects PDF link annotation
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/jipadanezamiwo.pdfIn PDF document text
    • https://sodefabufu.weebly.com/uploads/1/3/4/4/134473286/5e89040.pdfIn PDF document text
    • https://wuviruwex.weebly.com/uploads/1/3/4/7/134766268/kixasajowado_fuzarukomodu_fodek_wodelovibed.pdfIn PDF document text
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/9661057.pdfIn PDF document text
    • https://tewifevorifoja.weebly.com/uploads/1/3/4/3/134387655/mufowomikenumaf.pdfIn PDF document text
    • https://sexabadipeg.weebly.com/uploads/1/3/4/6/134684930/bevidibitej.pdfIn PDF document text
    • https://nawawuxilebop.weebly.com/uploads/1/3/4/6/134679594/modeparidu.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/554516c1-bd5e-440e-b747-3a1077c843f4/free_porn_gym.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/resident_evil_7_biohazard_para_android.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/waxutinutejopanud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09d76a31-4027-4109-bfe0-3aa10dfed668/50761467975.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000adfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADFD 8312 bytes
SHA-256: 7c2f4f4e0bff36247f8c2e2bd3e83321ba0f8406d16ca20fc2716370e959b428
font_01_sfnt_off0000ca27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA27 5408 bytes
SHA-256: 5cf222e56d1b5dc452c4dcc50721d649baf029b371cbe3c2b7d5bda21587403c
font_02_sfnt_off0000dc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8E 9476 bytes
SHA-256: 20cc25e0d0d5c5cdc51d25ccbc5271cc77bf15c7dbc8caaef6bdf5a80dee1725

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